Patent US4450723A successfully refreshed from Google Patents.
US4450723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-sample surface area measurement
Assignee: Phillips Petroleum Co
•
Filing: 1982-03-16
•
Granted: 1984-05-29
•
Expires: 2002-03-16
Abstract
Abstract The surface area of a plurality of samples is measured in an apparatus in which these samples are all included in a housing, subjected to adsorption of the adsorbing fluid and seriatim moved into a desorption zone in which one sample at a time is subjected to a desorption step. In another embodiment, a plurality of individual sample holders are each provided with an individual heating element to allow seriatim desorption by switching the heating of the samples from one heating element to the next. No movement of the sample holders is required in this embodiment. The apparatus and operation lends itself to automation.
Inventors
- 👤 Richard L. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:49
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/088; G01N15/0893
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
179 words
An apparatus for measuring the amount of a fluid adsorbed by each of a plurality of samples comprising (a) an adsorption and desorption zone provided with means for exposing the plurality of samples to said fluid, (b) a detector operatively connected to said adsorption and desorption zone and capable of detecting the fluid released from said sample and generating a signal representative of the quantity of said released fluid, (c) a plurality of sample holding means within said adsorption and desorption zone, (d) a plurality of individually controllable heating elements, each one sample holding means being associated with one of said heating elements such as to permit individual heating of each sample arranged in the respective sample holding means independently of the heating of all the other samples, (e) housing means enclosing said adsorption and desorption zone and separating said adsorption and desorption zone from uncontrolled contact with the surrounding atmosphere, (f) control means for activating each individual heating element in order to heat the sample associated with this heating element and to desorb said fluid from said sample.
Claim 2
Independent Claim
179 words
An apparatus for measuring the amount of a fluid adsorbed by each of a plurality of samples comprising (a) an adsorption and desorption zone provided with means for exposing the plurality of samples to said fluid, (b) a detector operatively connected to said adsorption and desorption zone and capable of detecting the fluid released from said sample and generating a signal representative of the quantity of said released fluid, (c) a plurality of sample holding means within said adsorption and desorption zone, (d) a plurality of individually controllable heating elements, each one sample holding means being associated with one of said heating elements such as to permit individual heating of each sample arranged in the respective sample holding means independently of the heating of all the other samples, (e) housing means enclosing said adsorption and desorption zone and separating said adsorption and desorption zone from uncontrolled contact with the surrounding atmosphere, (f) control means for activating each individual heating element in order to heat the sample associated with this heating element and to desorb said fluid from said sample.
Claim 3
Dependent Claim
53 words
Apparatus in accordance with claim 1 wherein a first conduit is operatively connected to said housing such as to provide a controllable connection between said adsorption and desorption zone and a source of carrier gas and adsorbing fluid and wherein a second conduit is operatively connected to said housing and to said detector.
Claim 4
Dependent Claim
51 words
Apparatus in accordance with claim 1 wherein said controller is operatively connected to said detector such as to seriatim activate the individual heating elements each activation being carried out after the concentration of the desorbed fluid has fallen below a given value and/or after the expiration of a given time period.
Claim 5
Dependent Claim
176 words
A process for determining the quantity of a fluid adsorbed by each of a plurality of samples comprising the following steps (a) introducing said plurality of samples in a plurality of sample holding means, each sample in an individual sample holding means, into a housing surrounding an adsorption and desorption zone and separating the adsorption and desorption zone and thus the samples in the sample holding means from uncontrolled contact with the surrounding atmosphere, said sample holding means being provided with individually actuated heating elements, (b) subjecting said samples at a low first temperature in the adsorption and desorption zone to said fluid for a time sufficient to achieve adsorption of said fluid on said samples, (c) heating one sample to effect desorption of said fluid of one sample while leaving the other samples essentially unchanged, (d) delivering the desorbed fluid to a detector, (e) generating a signal in said detector responsive to the quantity of fluid desorbed by the sample, (f) carrying out the desorption and signal generating steps seriatim on all of the samples.
Claim 6
Dependent Claim
176 words
A process for determining the quantity of a fluid adsorbed by each of a plurality of samples comprising the following steps (a) introducing said plurality of samples in a plurality of sample holding means, each sample in an individual sample holding means, into a housing surrounding an adsorption and desorption zone and separating the adsorption and desorption zone and thus the samples in the sample holding means from uncontrolled contact with the surrounding atmosphere, said sample holding means being provided with individually actuated heating elements, (b) subjecting said samples at a low first temperature in the adsorption and desorption zone to said fluid for a time sufficient to achieve adsorption of said fluid on said samples, (c) heating one sample to effect desorption of said fluid of one sample while leaving the other samples essentially unchanged, (d) delivering the desorbed fluid to a detector, (e) generating a signal in said detector responsive to the quantity of fluid desorbed by the sample, (f) carrying out the desorption and signal generating steps seriatim on all of the samples.
Claim 7
Dependent Claim
57 words
A process in accordance with claim 4 wherein said samples are subjected to the contact of a carrier gas and an adsorbing fluid, wherein said carrier gas is selected from the group consisting of hydrogen and helium and wherein said adsorbing fluid is selected from the group consisting of nitrogen, oxygen, argon, carbon dioxide, propane and n-butane.
Claim 8
Dependent Claim
26 words
A process in accordance with claim 1 wherein said samples are dried prior to the adsorption step within said housing surrounding said adsorption and desorption zone.
Claim 9
Dependent Claim
31 words
A process in accordance with claim 6 wherein said drying is effected by heating said samples, which heating is carried out by actuating said individually controllable heating elements simultaneously or seriatim.
References Cited (Backward Citations)
US2692497A
Cited
US2729969A
Cited
US2960870A
Cited
US3059478A
Cited
DE1129734B
Cited
US3211006A
Cited
US3222133A
Cited
US3255122A
Cited
US3203252A
Cited
US3211007A
Cited
US3262319A
Cited
US3296869A
Cited
US3306112A
Cited
US3349625A
Cited
US3299713A
Cited
US3295720A
Cited
US3482452A
Cited
US3500675A
Cited
US3509762A
Cited
US3464273A
Cited
US3555912A
Cited
US3732736A
Cited
US3707870A
Cited
US3771367A
Cited
US3783697A
Cited
US3850040A
Cited
US3884083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |