US4589782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermocentrifugometric analysis
Assignee: RESEARCH Corp TECHNOLOGIES Inc 6840 EAST BROADWAY BOULEVARD TUCSON AZ 85710 A NOT-FOR-PROFIT NON-STOCK CORP OF DE
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Filing: 1984-06-11
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Granted: 1986-05-20
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Expires: 2004-06-11
Abstract
Abstract A method and six devices for measuring the change in mass of a sample subjected to selected temperatures and fluid variables is disclosed. The test sample is subjected to centrifugal force to amplify the "apparent mass" of the sample by rotating the sample about a first axis of rotation. Any change in the mass of the test sample is then amplified by the centrifugal force and measured by the displacement or the displacement force of the sample. The above method and six separate devices are disclosed. The first device balances the mass of the test sample against a known reference weight. The second device generates a counter-rotational force about a second axis to bring the sample to a "nulled" position. The third device balances the force generated about the second axis against a known and adjustable balance beam. A reciprocating means is used to couple the balance beam to a rotating sample holder. The fourth device generates a counter force along the balance beam to bring the sample to a "nulled" position. The radial displacement force is measured in the fifth device and the radial displacement is measured in the sixth device. The devices are particularly adapted for mass change analysis in high temperature environments using high sweep gas rates and a variety of gaseous fluids.
Inventors
- 👤 Jin Y. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:50
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/30; G01N5/00
Claims Analysis
Total Claims: 84
Claim 1
Independent Claim
120 words
A method for measuring a change in mass of a test sample when the sample is subjected to at least one selected temperature and fluid, said process comprising: (a) rotating a test sample about an axis to subject the sample to centrifugal force; (b) subjecting the test sample to at least one selected temperature and fluid to effect a change in mass of the test sample; (c) measuring a displacement force generated during the rotation of the test sample to determine a change in mass during an interval of time; whereby any change in mass in the test sample may be measured by a derivative value of the displacement forces generated at the beginning and end of said time interval.
Claim 2
Independent Claim
120 words
A method for measuring a change in mass of a test sample when the sample is subjected to at least one selected temperature and fluid, said process comprising: (a) rotating a test sample about an axis to subject the sample to centrifugal force; (b) subjecting the test sample to at least one selected temperature and fluid to effect a change in mass of the test sample; (c) measuring a displacement force generated during the rotation of the test sample to determine a change in mass during an interval of time; whereby any change in mass in the test sample may be measured by a derivative value of the displacement forces generated at the beginning and end of said time interval.
Claim 3
Dependent Claim
40 words
A method for measuring a change in mass of a test sample as claimed in claim 1, wherein the displacement force generated by the rotating test sample is measured to obtain a derivative value of the mass of the sample.
Claim 4
Dependent Claim
39 words
A method for measuring a change in mass of a test sample as claimed in claim 1 wherein the speed of rotation is varied to balance the displacement force generated by the test sample against a known reactive force.
Claim 5
Dependent Claim
58 words
A method of measuring a change in mass of a test sample as claimed in claim 3 which further includes the step of suspending the test sample from a rotatable means, said means having a second axis of rotation perpendicular to the axis of rotation in step (a), and measuring a displacement about the second axis of rotation.
Claim 6
Independent Claim
51 words
A method for measuring a change in mass of a test sample as claimed in 1 or 2 or 3 or 4 which further includes the step of generating at least one reactive force to balance the displacement force generated by the rotating test sample, and then measuring the reactive force.
Claim 7
Independent Claim
119 words
A method for measuring a change in mass of a test material when the test material is subjected to at least one selected temperature and fluid, said process comprising: (a) rotating the test material about an axis to subject the test material to centrifugal force; (b) subjecting the test material to a selected temperature and fluid to effect a change in mass of the test material; (c) measuring a displacement of the sample during the rotation of the test sample to determine a change in mass during an interval of time; whereby any change in mass in the test sample may be measured by a derivative value of the displacement at the beginning and end of said time interval.
Claim 8
Independent Claim
119 words
A method for measuring a change in mass of a test material when the test material is subjected to at least one selected temperature and fluid, said process comprising: (a) rotating the test material about an axis to subject the test material to centrifugal force; (b) subjecting the test material to a selected temperature and fluid to effect a change in mass of the test material; (c) measuring a displacement of the sample during the rotation of the test sample to determine a change in mass during an interval of time; whereby any change in mass in the test sample may be measured by a derivative value of the displacement at the beginning and end of said time interval.
Claim 9
Dependent Claim
39 words
A method for measuring a change in mass of a test sample as claimed in claim 6 wherein the displacement generated by the rotating test sample is measured to obtain a derivative value of the mass of the sample.
Claim 10
Independent Claim
104 words
A method for measuring a change in mass of a test material when said test material is subjected to at least one selected temperature and fluid, said process comprising: (a) balancing a test material with one or more known reactive force(s), said test material being placed in a rotatable test material receiving means, (b) rotating said test material receiving means about an axis to subject said test material to centrifugal force, (c) subjecting the test material to at least one selected temperature in fluid to effect a change in mass of said test material, (d) measuring the change in mass of said test material.
Claim 11
Independent Claim
104 words
A method for measuring a change in mass of a test material when said test material is subjected to at least one selected temperature and fluid, said process comprising: (a) balancing a test material with one or more known reactive force(s), said test material being placed in a rotatable test material receiving means, (b) rotating said test material receiving means about an axis to subject said test material to centrifugal force, (c) subjecting the test material to at least one selected temperature in fluid to effect a change in mass of said test material, (d) measuring the change in mass of said test material.
Claim 12
Dependent Claim
43 words
A method for measuring a change in mass of a test material as claimed in claim 8, wherein the test material is placed in a displaceable and rotatable test material receiving means, and the displacement is measured to determine the change in mass.
Claim 13
Dependent Claim
24 words
A method for measuring a change in mass of a test material is claimed in claim 8, wherein the speed of rotation is varied.
Claim 14
Dependent Claim
34 words
A method for measuring a change in mass of a test material as claimed in claim 8 wherein the speed of rotation is varied to balance the change in mass of the test material.
Claim 15
Dependent Claim
36 words
A method for measuring a change in mass of a test material as claimed in claim 8, wherein the speed of rotation and one or more reactive forces are varied to continuously balance the test material.
Claim 16
Dependent Claim
58 words
A method for measuring the change in mass of a test sample as claimed in claim 1 or 2 or 3 or 4 or 6 or 7 or 8 or 9 or 10 or 11 or 12 which further includes the step of rotating the sample in a sample receiving means rotatable between 200 rpm and 5000 rpm.
Claim 17
Dependent Claim
37 words
A method of measuring the change in mass of a test sample as claimed in claim 13, which further includes the step of directing a high velocity gaseous fluid against the test sample as it is rotated.
Claim 18
Dependent Claim
70 words
A method of measuring the change in mass of a test sample as claimed in claim 1 or 2 or 3 or 4 or 6 or 7 or 8 or 9 or 10 or 11 or 12 which further includes the steps of: (a) rotating the sample at a speed of at least 200 rpm; (b) elevating the temperature of the ambient atmosphere surrounding the sample to a preselected temperature.
Claim 19
Dependent Claim
30 words
A method of measuring the change in mass of a test sample as claimed in claim 15 which further includes the step of surrounding the sample with a preselected fluid.
Claim 20
Dependent Claim
39 words
A method of measuring the mass of a test sample as claimed in claim 16, which further includes the step of suspending the sample, which is solid, for rotation and sublimating it by a reaction with a preselected fluid.
Claim 21
Independent Claim
35 words
A method for measuring a change in mass of a test sample as claimed in claims 1 or 2 or 3 or 4 or 7 or 8 wherein the change in mass is continuously measured.
Claim 22
Dependent Claim
57 words
A method for measuring a change in mass of a test sample as claimed in claim 1 or 2 or 3 or 4 or 7 or 8 wherein the change in mass is adapted to be measured by a differentiated value of displacement forces at the beginning and end of at least one finite interval of time.
Claim 23
Dependent Claim
57 words
A method for measuring a change in mass of a test sample as claimed in claim 1 or 2 or 3 or 4 or 8 which further includes the step of varying at least one adjustable force element to balance a change in displacement force generated by the test sample as it undergoes a change in mass.
Claim 24
Dependent Claim
47 words
A method for measuring a change in mass of a test sample as claimed in claim 20, which further includes the step of simultaneously varying the speed of rotation and at least one adjustable force element to balance the changing displacement force generated by the test sample.
Claim 25
Dependent Claim
59 words
A method for measuring a change in mass of a test sample as claimed in claim 1 or 4 or 6 or 7 or 8 which further includes the steps of: (a) placing the test sample in a displaceable sample receiving means; (b) balancing the test sample receiving means with a known reactive force before said sample is rotated.
Claim 26
Dependent Claim
34 words
A method for measuring a change in mass of a test sample as claimed in claim 22 wherein the known reactive force is generated by a reference weight before the test sample is rotated.
Claim 27
Dependent Claim
37 words
A method for measuring a change in mass of a test sample as claimed in claim 22 which further includes the step of generating one or more compensating forces to compensate for one or more rotating elements.
Claim 28
Dependent Claim
52 words
A method for measuring a change in mass of a test sample as claimed in claim 1 or 2 or 3 or 6 or 7 or 8 which further includes the step of measuring the displacement force generated with a transducer means positioned between the test sample and the axis of rotation.
Claim 29
Independent Claim
46 words
A method for measuring a change in mass of a test sample as claimed in claims 1 or 2 or 3 or 4 or 8 which further includes the step of generating a reactive force to balance the displacement force generated with a variable beam balance.
Claim 30
Dependent Claim
126 words
A thermocentrifugometric analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) a rotating shaft and means for rotating said shaft around a first axis of rotation; (b) a test material holding means extending outwardly from said shaft to hold a test material while it is rotated about said axis of rotation; (c) an enclosure means for subjecting the test material to at least one preselected temperature and fluid to effect a change of mass of said sample; (d) a means for measuring a displacement force generated by said test material holding means when said test material is rotated about said axis of rotation and is subjected to said selected temperature and fluid.
Claim 31
Dependent Claim
126 words
A thermocentrifugometric analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) a rotating shaft and means for rotating said shaft around a first axis of rotation; (b) a test material holding means extending outwardly from said shaft to hold a test material while it is rotated about said axis of rotation; (c) an enclosure means for subjecting the test material to at least one preselected temperature and fluid to effect a change of mass of said sample; (d) a means for measuring a displacement force generated by said test material holding means when said test material is rotated about said axis of rotation and is subjected to said selected temperature and fluid.
Claim 32
Dependent Claim
46 words
A thermocentrifugometric analyzer as claimed in claim 27, wherein said means for measuring the displacement force further comprises a means for generating a null force to balance a displacement force generated by the rotating sample, and means for measuring the magnitude of the null force generated.
Claim 33
Dependent Claim
34 words
A thermocentrifugometric analyzer as claimed in claim 27, wherein said analyzer further includes a means for measuring the displacement force generated by the test sample at selected points in time as it is rotated.
Claim 34
Dependent Claim
20 words
A thermocentrifugometric analyzer as claimed in claim 27, wherein said means for measuring the displacement force comprises a balance beam.
Claim 35
Dependent Claim
80 words
A thermocentrifugometric analyzer as claimed in claim 30, wherein said balance beam initially balances the test material and test material holding means while rotating, said analyzer also having a control means for maintaining a dynamic balance of said apparatus with a variable null force to offset a change in the displacement force generated by the rotating test material, whereby any change in mass, over time, will be measured as a derivative value of the magnitude of the null force generated.
Claim 36
Dependent Claim
42 words
A thermocentrifugometric analyzer as claimed in claim 31, wherein said analyzer further includes a means for varying the speed of rotation of said shaft to rebalance said test sample to a reference weight as said test material undergoes a change in mass.
Claim 37
Dependent Claim
28 words
A thermocentrifugometric analyzer as claimed in claim 27, wherein said analyzer further includes a means for varying the speed of rotation of said shaft and said test material.
Claim 38
Dependent Claim
41 words
A thermocentrigugometric analyzer as claimed in claims 33 wherein said test material holding means is pivotably mounted on said shaft to rotate about a second axis of rotation, said second axis of rotation being perpendicular to said first axis of rotation.
Claim 39
Dependent Claim
32 words
A thermocentrigugometric analyzer as claimed in claim 34, wherein said analyzer further includes a reference weight to balance said test material about said second axis of rotation before said shaft is rotated.
Claim 40
Dependent Claim
123 words
A thermocentrifugometric analyzer as claimed in claim 27, which further comprises: (a) a means for generating a null force to offset a change in displacement force generated by the rotating test material; (b) a means for varying the null force in response to a change in displacement force and a means for generating a null signal representative of the applied null force; (c) a means for varying the speed of rotation to vary the magnitude of the displacement force generated by the test material and a means for generating a signal representative of the speed of rotation; (d) a means for measuring the mass of the test material as a value derived from the displacement force signal and the speed of rotation signal.
Claim 41
Dependent Claim
27 words
A thermocentrifugometric analyzer as claimed in claim 36, wherein said analyzer further includes a reference weight of known mass to effectively vary the range of mass measurement.
Claim 42
Dependent Claim
122 words
A thermocentrifugometric analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) a rotating shaft and means for rotating said shaft around a first axis of rotation; (b) a test material holding means extending outwardly from said shaft to hold a test material while it is rotated about said axis of rotation; (c) an enclosure means for subjecting the test material to at least one preselected temperature and fluid to effect a change in mass of said test material; (d) a means for measuring any displacement of said test material when said test material is rotated about said axis of rotation and subjected to said selected temperature and fluid.
Claim 43
Dependent Claim
122 words
A thermocentrifugometric analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) a rotating shaft and means for rotating said shaft around a first axis of rotation; (b) a test material holding means extending outwardly from said shaft to hold a test material while it is rotated about said axis of rotation; (c) an enclosure means for subjecting the test material to at least one preselected temperature and fluid to effect a change in mass of said test material; (d) a means for measuring any displacement of said test material when said test material is rotated about said axis of rotation and subjected to said selected temperature and fluid.
Claim 44
Dependent Claim
28 words
A thermocentrifugometric analyzer as claimed in claim 38 wherein said analyzer further includes a means for varying the speed of rotation of said shaft and said test material.
Claim 45
Dependent Claim
62 words
A thermocentrifugometric analyzer as claimed in claim 27 or 28 or 30 or 33 or 34 or 38 or 39, wherein said analyzer further includes an annular chamber surrounding a rotational path defined by said test material, said annular chamber having a series of radial baffles therein for converting circumferential flow of said selected fluid into a series of radial flow patterns.
Claim 46
Dependent Claim
79 words
A thermocentrifugometric analyzer as claimed in claim 27 or 28 or 30 or 33 or 34 or 38 or 39, wherein said test material holding means further includes a solid sample holder for receiving said test material, said sample holder having a first inlet opening oriented in the defined direction of rotation, a second outlet opening oriented along a radial axis when said analyzer is rotating, and means for retaining a solid test sample adjacent said second outlet opening.
Claim 47
Dependent Claim
46 words
A thermocentrifugometric analyzer as claimed in claim 27 or 28 or 30 or 33 or 34 or 38 or 39, wherein said analyzer further includes an annular reaction chamber, an autoclave surrounding said reaction chamber, and means for introducing a preselected fliud into said reaction chamber.
Claim 48
Dependent Claim
26 words
A thermocentrifugometric analyzer as claimed in claim 42, wherein said annular reaction chamber is formed of a high temperature resistant material such as glass or quartz.
Claim 49
Dependent Claim
106 words
A thermocentrifugometric analyzer as claimed in claim 27 or 28 or 30 or 33 or 34 or 38 or 39, wherein said enclosure means for subjecting the test material to preselected temperature and fluid variables further comprises: (a) a means for admitting at least one preselected fluid; (b) a means for withdrawing the preselected fluid; (c) a heating means; (d) a means for measuring the temperature of the fluid at least at one point in the enclosure space; (e) a control means responsive to the temperature measuring means for raising or lowering the temperature in a predicted manner and maintaining the temperature at a desired value.
Claim 50
Dependent Claim
52 words
A thermocentrifugometric analyzer as claimed in claim 33 or 39, wherein the means for rotating said shaft at variable speeds is responsive to said means for measuring the displacement force; whereby the displacement force generated by the test sample is maintained at a constant value as the speed of rotation is varied.
Claim 51
Dependent Claim
34 words
A thermocentrifugometric analyzer as claimed in claim 27 or 28 or 29 or 33 or 38 or 39, wherein said test material holding means is connected to said shaft by an outwardly extending arm.
Claim 52
Dependent Claim
55 words
A thermocentrifugometric analyzer as claimed in claim 27 or 29 or 33 or 38 or 39, wherein said enclosure is comprised of an annular chamber surrounding a rotational path defined by said test material, an inner chamber surrounding the rotating shaft, and a middle disc like space connecting said inner chamber to said outer chamber.
Claim 53
Dependent Claim
34 words
A thermocentrifugometric analyzer as claimed in claim 27 or 28 or 33 or 38 or 39, wherein said analyzer further includes a reference weight to balance said test material before said shaft is rotated.
Claim 54
Dependent Claim
89 words
A thermocentrifugometric analyzer as claimed in claim 27 or 29 or 38 or 39, wherein said analyzer further includes a cantilever beam mounted on said rotating shaft, said cantilever being supported by a first beam having a center axis aligned along the axis of rotation of said shaft, with said cantilever beam supporting said test material holding means, said analyzer also including a strain gauge mounted on said first beam for measuring a linear displacement force generated by measuring forces transmitted to the first beam by said cantilever beam.
Claim 55
Dependent Claim
40 words
A thermocentrifugometric analyzer as claimed in claim 27 or 28 or 38 or 39, wherein said analyzer further includes a reference mass to be rotated and thereby offset the force generated by the mass of said test material holding means.
Claim 56
Dependent Claim
21 words
A thermocentrifugometric analyzer as claimed in claim 27 or 29 or 38, wherein said measuring means further comprises a load cell.
Claim 57
Dependent Claim
47 words
A thermocentrifugometric analyzer as claimed in claim 29 or or 38, wherein said analyzer further includes a reference weight mounted to generate an opposing linear displacement force to at least partially offset the displacement force of said rotating test material holding means that is generated during testing.
Claim 58
Dependent Claim
37 words
A thermocentrifugometric analyzer as claimed in claim 27 or or 38, wherein said analyzer further includes a strain gauge mounted on said rotating shaft for measuring displacement force transmitted by said holding means to said rotating shaft.
Claim 59
Dependent Claim
35 words
A thermocentrifugometric analyzer as claimed in claim 27 or 38, wherein said analyzer further includes a compensator means mounted on a support means to compensate for the rotating mass of said test material holding means.
Claim 60
Dependent Claim
170 words
A thermocentrifugometric mass analyzer for measuring the mass change of a test material subjected to selected temperature and fluid variables, said analyzer comprising: (a) a rotating shaft, and means for rotating said shaft at varying speeds about a first axis of rotation, (b) a test material holding means extending outwardly from said shaft to hold said test material while it is rotated about said first axis of rotation, (c) an enclosure means for surrounding the rotating test material and subjecting said test material to at least one preselected temperature and fluid to effect a change in mass of said test test sample, (d) a balance beam for balancing at least one null force and the centrifugal force generated by said rotating test material, (e) means for translating a centrifugal force generated by said rotating test material to a reciprocal force connected to said balance beam, (f) means for measuring the change in mass of said test sample from a change in the null force necessary to balance said balance beam.
Claim 61
Dependent Claim
170 words
A thermocentrifugometric mass analyzer for measuring the mass change of a test material subjected to selected temperature and fluid variables, said analyzer comprising: (a) a rotating shaft, and means for rotating said shaft at varying speeds about a first axis of rotation, (b) a test material holding means extending outwardly from said shaft to hold said test material while it is rotated about said first axis of rotation, (c) an enclosure means for surrounding the rotating test material and subjecting said test material to at least one preselected temperature and fluid to effect a change in mass of said test test sample, (d) a balance beam for balancing at least one null force and the centrifugal force generated by said rotating test material, (e) means for translating a centrifugal force generated by said rotating test material to a reciprocal force connected to said balance beam, (f) means for measuring the change in mass of said test sample from a change in the null force necessary to balance said balance beam.
Claim 62
Dependent Claim
40 words
A thermocentrifugometric mass analyzer as claimed in claim 55 wherein said means for measuring calculates the initial mass and a change in mass from the speed of rotation and the sum of the null force(s) applied to said balance beam.
Claim 63
Dependent Claim
30 words
A thermocentrifugometric mass analyzer as claimed in claim 56 wherein said analyzer further includes means for applying at least one predetermined force and one variable force to said balance beam.
Claim 64
Dependent Claim
145 words
A thermocentrifugometric mass analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) a rotating shaft, and means for rotating said shaft about a first axis of rotation, (b) a test material holding means extending radially outwardly from said first axis of rotation to hold said test material while it is rotated about said first axis of rotation, (c) enclosure means for surrounding the rotating test material and subjecting said test material to at least one selected temperature and fluid to effect the change in mass of said test sample, (d) a transducer means mounted between said rotating test material and said axis of rotation to convert the centrifugal force generated by said rotating test material into an electrical signal, (e) means for computing a change in mass from said electrical signal.
Claim 65
Dependent Claim
145 words
A thermocentrifugometric mass analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) a rotating shaft, and means for rotating said shaft about a first axis of rotation, (b) a test material holding means extending radially outwardly from said first axis of rotation to hold said test material while it is rotated about said first axis of rotation, (c) enclosure means for surrounding the rotating test material and subjecting said test material to at least one selected temperature and fluid to effect the change in mass of said test sample, (d) a transducer means mounted between said rotating test material and said axis of rotation to convert the centrifugal force generated by said rotating test material into an electrical signal, (e) means for computing a change in mass from said electrical signal.
Claim 66
Dependent Claim
18 words
A thermocentrifugometric mass analyzer as claimed in claim 58 wherein said transducer is mounted on a rotating shaft.
Claim 67
Dependent Claim
36 words
A thermocentrifugometric mass analyzer as claimed in claim 58 wherein said transducer is a load cell mounted to measure the radial force generated by the test material and test material holding means as they are rotated.
Claim 68
Dependent Claim
75 words
A thermocentrifugometric mass analyzer as claimed in claim 58 wherein said test material holding means further comprises: (a) a reciprocating arm which reciprocates along a radial axis from said axis of rotation, (b) means for resiliently biasing said arm to a first predetermined position to thereby oppose radially outward reciprocation of said arm during rotation of said test material and test material holding means, (c) said transducer means measuring the radial reciprocation of said arm.
Claim 69
Dependent Claim
48 words
A thermocentrifugometric mass analyzer as claimed in claim 59 or 60 or 61 which further includes a compensator means mounted on said rotating shaft to generate an opposing radial displacement force to thereby at least partially offset the displacement force generated by said rotating test material holding means.
Claim 70
Dependent Claim
37 words
A thermocentrifugometric mass analyzer as claimed in claim 59 or 60 or 61 which further includes means for varying the rotational speed of said rotating shaft in response to a change in mass of said test material.
Claim 71
Dependent Claim
114 words
A thermocentrifugometric mass analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) first means for rotating a test sample to increase its apparent mass through centrifugal force, said means rotating about a first axis of rotation, (b) a test material holding means mounted on said first means and spaced from said axis of rotation for supporting said test material during rotation, (c) second means for subjecting said test sample to at least one selected temperature and fluid to effect a change in mass in said test material, (d) third means for measuring the change in mass of said test material.
Claim 72
Dependent Claim
114 words
A thermocentrifugometric mass analyzer for measuring the mass change of a test material subjected to at least one selected temperature and fluid, said analyzer comprising: (a) first means for rotating a test sample to increase its apparent mass through centrifugal force, said means rotating about a first axis of rotation, (b) a test material holding means mounted on said first means and spaced from said axis of rotation for supporting said test material during rotation, (c) second means for subjecting said test sample to at least one selected temperature and fluid to effect a change in mass in said test material, (d) third means for measuring the change in mass of said test material.
Claim 73
Dependent Claim
23 words
A thermocentrifugometric mass analyzer as claimed in claim 64 which further includes variable drive means for changing the rotational speed of the analyzer.
Claim 74
Dependent Claim
70 words
A thermocentrifugometric mass analyzer as claimed in claim 65 wherein said test material holding means further includes a null motor having a second axis of rotation transverse to said first axis, said null motor generating a variable reaction force to compensate for a mass change in said test material; said null motor providing an output signal for said third means for measuring the change in mass of the test material.
Claim 75
Dependent Claim
28 words
A thermocentrifugometric mass analyzer as claimed in claim 64 which further includes compensating means to balance the apparent mass of the test material holding means during rotation thereof.
Claim 76
Dependent Claim
30 words
A thermocentrifugometric mass analyzer as claimed in claim 64 wherein said means for measuring the change in mass includes a transducer for generating an electrical signal responsive to said change.
Claim 77
Dependent Claim
44 words
A thermocentrifugometric mass analyzer as claimed in claim 68 which further includes: (a) variable drive means for changing the rotational speed of the analyzer, (b) control means responsive to said electric signal to vary the rotational speed in response to a change in mass.
Claim 78
Dependent Claim
42 words
A thermocentrifugometric mass analyzer as claimed in claim 64, 65, 66, 67, 68 or 69 wherein said means for subjecting said test sample to at least one selected temperature and fluid includes an autoclave chamber for heating the test material during rotation.
Claim 79
Dependent Claim
161 words
A thermocentrifugometric mass analyzer for measuring the mass of a test material subjected to at least one selected temperature, said analyzer comprising: (a) rotatable means for rotating said test material at a plurality of selected speeds about about a first axis to thereby subject the test material to centrifugal force and thereby increase its apparent mass, (b) a test material support means, said support means mounted on said rotatable means and supporting said test material means for rotation about a second axis of rotation, (c) null motor means for generating a counter rotational force to oppose rotation about an axis of rotation, said null motor means providing an electrical signal indicative of the counter rotational force applied to said test material support means, (d) means for subjecting the test material to at least one preselected temperature, (e) means for measuring the mass of the test material, said means responsive to said selected speed and said electrical signal to derive said measurement.
Claim 80
Dependent Claim
161 words
A thermocentrifugometric mass analyzer for measuring the mass of a test material subjected to at least one selected temperature, said analyzer comprising: (a) rotatable means for rotating said test material at a plurality of selected speeds about about a first axis to thereby subject the test material to centrifugal force and thereby increase its apparent mass, (b) a test material support means, said support means mounted on said rotatable means and supporting said test material means for rotation about a second axis of rotation, (c) null motor means for generating a counter rotational force to oppose rotation about an axis of rotation, said null motor means providing an electrical signal indicative of the counter rotational force applied to said test material support means, (d) means for subjecting the test material to at least one preselected temperature, (e) means for measuring the mass of the test material, said means responsive to said selected speed and said electrical signal to derive said measurement.
Claim 81
Dependent Claim
35 words
A thermocentrifugometric mass analyzer as claimed in claim 71 which further includes compensating means mounted on said support means to balance rotational moments about said second axis prior to the loading of a test material.
Claim 82
Dependent Claim
27 words
A thermocentrifugometric mass analyzer as claimed in claim 71 wherein the speed of rotation about said first axis is varied in response to a change in mass.
Claim 83
Dependent Claim
44 words
A thermocentrifugometric mass analyzer as claimed in claim 71 or 72 or 73 which further includes an autoclave chamber for surrounding the rotational path of said test material, and elevating the temperature of the fluid surrounding said sample to at least one preselected temperature.
Claim 84
Dependent Claim
28 words
A thermocentrifugometric mass analyzer as claimed in claim 74 which further includes means for thermally separating the rotational path of said test sample and said null motor means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |