US3221849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric-field-responsive fluid device
Assignee: Union Oil Company of California
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Filing: 1961-06-30
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Granted: 1965-12-07
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Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Donald L Klass
- 👤 Brozowski Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:37
CPC Classifications
F; F16; F16D; F16D37/00; F16D37/008; C; C10; C10M; C10M171/00; C10M171/001
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
A TRANSIENT-ELECTRIC-POTENTIAL-RESPONSIVE COUPLING COMPRISING COAXIAL RELATIVELY ROTATABLE MENBERS ARRANGED TO PROVIDE OPPOSED SURFACES SPACED FROM EACH OTHER A DISTANCE OF ABOUT 0.0005 TO 0.50 INCH, ONE OF SAID MEMBERS SUPPORTING A PLURALITY OF METAL ELECTRODES IN ELECTRICALLY INSULATED RELATIONSHIP, EACH OF SAID ELECTRODES HAVING A BARE EXPOSED SURFACE FACING SAID SECOND MEMBER, THE SURFACE OF SAID SECOND MEMBER FACING SAID ELECTRODES EBEING ELECTRICALLY CONDUCTIVE, A THIN LAYER OF FLUID, WHICH EXHIBITS AN APPARENT CHANGE IN BULK VISCOSITY UNDER THE INFLUENCE OF AN ALTERNATING ELECTRIC FIELD, DISPOSED BETWEEN SAID MEMBERS, AND MEANS FOR APPLYING TRANSIENT ELECTRIC POTENTIAL TO SAID ELECTRODES.
References Cited (Backward Citations)
US2568824A
Cited
US2663809A
Cited
US2897424A
Cited
FR1163513A
Cited
GB830101A
Cited
US3150678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |