US3239041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of varying bulk modulus of electroviscous fluid
Assignee: Union Oil Company of California
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Filing: 1962-04-13
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Granted: 1966-03-08
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Expires: 1982-04-13
Abstract
No abstract record available.
Inventors
- 👤 Donald L Klass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:02
CPC Classifications
F; F16; F16D; F16D37/00; F16D37/02; B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5027; B01L3/50273; F04; F04B; F04B17/00; F04B19/00; F04B19/006; F04B43/00; F04B43/02; F04B43/04; F04B43/043; F15; F15D; F15D1/00; F15D1/10; F15D1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN THE METHOD OF VARYING THE FORCE TRANSMITTED BETWEEN SPACED COUPLING MEMBERS OF A COUPLING THE MEM. BERS OF WHICH ARE SEPARATED BY AN ELECTROVISCOUS FLUID FILM AND ACROSS WHICH AN ALTERNATING CURRENT IS APPLIED TRANSVERSELY TO THE FILM, THE STEP OF VARYING THE FREQUENCY OF SAID CURRENT IN THE RANGE FROM BELOW THE CUT-OFF FREQUENCY OF THE FLUID TO ABOVE THE CUT-OFF FREQUENCY OF THE FLUID.
Claim 2
Dependent Claim
70 words
AN ELECTROVISCOUS FLUID DEVICE COMPRISING A PAIR OF SPACED CONDUCTIVE ELEMENTS, A FILM OF ELECTROVISCOUS FLUID IN CONTACT WITH SAID PAIR OF CONDUCTIVE ELEMENTS, SAID ELEMENTS BEING CONNECTED TO A SOURCE OF ALTERNATING CURRENT AND MEANS FOR CHANGING THE FRERQUENCY OF SAID ALTERNATING SURRENT ACROSS SAID FILM OF ELECTROVISCOUS FLUID, FROM A FREQUENCY BELOW THE CUT-OFF FREQUENCY OF SAID FLUID TO A FREQUENCY ABOVE THE CUT-OFF FREQUENCY OF SAID FLUID.
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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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |