Patent US6014692A successfully refreshed from Google Patents.
Patent US3677069A successfully refreshed from Google Patents.
US3677069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planar viscometer
Assignee: Eastman Kodak Co
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Filing: 1970-08-06
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Granted: 1972-07-18
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Expires: 1990-08-06
Abstract
Abstract For measuring the viscosity of a thin planar film of fluid which may be simple, may contain solid particles in suspension, may be a mixture of several fluids, or may be any combination of these; a planar viscometer including (1) a mixing tank, (2) a planar flow generator including in series a long straight cylinder, a long diffuser, a short converging nozzle and a planar transition section of constant section, and (3) means forming a laminar flow passage.
Inventors
- 👤 Jacob C Rubin
- 👤 Gerald J Sukel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:59
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/02; G01N11/04; G01N11/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
A viscometer for measuring the coefficient of viscosity of a thin film of fluid flowing along a planar path, the coefficient of viscosity being a function of the difference in magnitude between pressures over the flow path and of the volumetric flow rate, said viscometer comprising: a planar flow generator including an inlet for receiving fluid, an outlet, and means for delivering said received fluid to said outlet in a thin film planar flow; a source for delivering said fluid to said generator inlet at a predetermined pressure and temperature; a laminar flow passage having an inlet connected to said generator outlet and having an outlet connected to a second predetermined pressure source; and means for measuring the volumetric flow rate of said fluid from said passage outlet.
Claim 2
Dependent Claim
128 words
A viscometer for measuring the coefficient of viscosity of a thin film of fluid flowing along a planar path, the coefficient of viscosity being a function of the difference in magnitude between pressures over the flow path and of the volumetric flow rate, said viscometer comprising: a planar flow generator including an inlet for receiving fluid, an outlet, and means for delivering said received fluid to said outlet in a thin film planar flow; a source for delivering said fluid to said generator inlet at a predetermined pressure and temperature; a laminar flow passage having an inlet connected to said generator outlet and having an outlet connected to a second predetermined pressure source; and means for measuring the volumetric flow rate of said fluid from said passage outlet.
Claim 3
Dependent Claim
140 words
A planar viscometer as defined in claim 1 wherein said planar flow generator comprises: a first section defining said first inlet and having a geometric configuration adapted to create a flow pattern of received fluid which is irrotational and substantially without secondary flow interference; a second section connected to receive fluid from said first section, said second section having a geometrical configuration adapted to create a fluid reservoir by gradual velocity-to-pressure recovery; a third section connected to receive fluid from said reservoir, said third section having a geometrical configuration for developing secondary flows in two dimensions in said fluid; and a fourth section defining said first outlet and connected to receive fluid from said third section, said fourth section having a geometrical configuration adapted to develop only one dimensional secondary flow in said fluid for delivery to said first outlet.
Claim 4
Dependent Claim
17 words
A viscometer as defined in claim 2 wherein the geometrical configuration of said first section is cylindrical.
Claim 5
Dependent Claim
30 words
A viscometer as defined in claim 2 wherein the geometrical configuration of said second section is that of a truncated cone having its larger diameter connected to said third section.
Claim 6
Dependent Claim
32 words
A viscometer as defined in claim 2 wherein the geometrical configuration of said third section is that of a short truncated cone having the shorter diameter thereof connected to said fourth section.
Claim 7
Dependent Claim
62 words
A viscometer as defined in claim 2 wherein said fourth section has an inlet of generally circular cross section, an outlet of generally rectangular cross section, and walls connecting the inlet and outlet of said fourth section such that the cross-sectional area along said fourth section is constant, whereby fluid exits from said first outlet with only one dimension of secondary flow.
Claim 8
Independent Claim
145 words
A method of measuring the coefficient of viscosity of a thin film of fluid flowing along a planar path, said method comprising the steps of: creating an irrotational flow pattern in a fluid at a first position, said flow pattern being substantially without secondary flow interference; creating a fluid reservoir at a second position from fluid received from said first position, said reservoir being created by gradual velocity-to-pressure recovery; developing secondary flows in two dimensions at a third position in fluid received from said second position; creating flow at a fourth position from fluid received from said third position, said flow at said fourth position having only one dimensional secondary flow; delivering fluid from said fourth position to a planar flow passage; measUring the pressure drop of the fluid along said planar flow passage; and measuring the volumetric fluid flow rate through said flow passage.
Claim 9
Independent Claim
145 words
A method of measuring the coefficient of viscosity of a thin film of fluid flowing along a planar path, said method comprising the steps of: creating an irrotational flow pattern in a fluid at a first position, said flow pattern being substantially without secondary flow interference; creating a fluid reservoir at a second position from fluid received from said first position, said reservoir being created by gradual velocity-to-pressure recovery; developing secondary flows in two dimensions at a third position in fluid received from said second position; creating flow at a fourth position from fluid received from said third position, said flow at said fourth position having only one dimensional secondary flow; delivering fluid from said fourth position to a planar flow passage; measUring the pressure drop of the fluid along said planar flow passage; and measuring the volumetric fluid flow rate through said flow passage.
Claim 10
Dependent Claim
60 words
A method as defined in claim 7 further comprising the step of calculating a value for the coefficient of viscosity using the formula Mu the coefficient of viscosity, w the width of said flow passage, a the height of said flow passage, L the length of said flow passage, p the pressure drop, and Q the volumetric fluid flow rate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |