US4113384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscosity measuring system
Assignee: Sunoco Inc R&M
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Filing: 1977-04-26
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Granted: 1978-09-12
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Expires: 1997-04-26
Abstract
Abstract A method for measuring the viscosity of a lubricant fluid under very high pressures by placing a sample of lubricant containing one or more ruby crystals (˜10μm diameter) in a diamond anvil cell illuminated with a point source of visible light radiation, and observing by means of appropriate optics the rate of change of band width of the ruby emission spectra at given temperatures and pressures as a measure of the viscosity of the fluid.
Inventors
- 👤 James L. Lauer
- 👤 Melvin E. Peterkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:03
CPC Classifications
G; G01; G01N; G01N11/00; G01N33/00; G01N33/26; G01N33/28; G01N33/2888; G01N33/30; G01N2011/0006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A method for measuring the viscosity of a lubricant fluid under very high pressures by placing a sample of lubricant contaning one or more rube crystals in a diamond anvil cell illuminated with a point source of visible light radiation, observing the rate of change of the width at half-height of the R 1 fluorescence band of the ruby emission spectra at given temperatures and pressures and correlating said change with an empirical calibration of a fluid of known viscosity under the same conditions.
Claim 2
Independent Claim
84 words
A method for measuring the viscosity of a lubricant fluid under very high pressures by placing a sample of lubricant contaning one or more rube crystals in a diamond anvil cell illuminated with a point source of visible light radiation, observing the rate of change of the width at half-height of the R 1 fluorescence band of the ruby emission spectra at given temperatures and pressures and correlating said change with an empirical calibration of a fluid of known viscosity under the same conditions.
Claim 3
Dependent Claim
19 words
The method of claim 1 where the visible light source is a zirconium arc filtered to remove blue radiation.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the ruby crystals will have a diameter of about 10 μm.
References Cited (Backward Citations)
US3526127A
Cited
US4009962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |