Patent US3587405A successfully refreshed from Google Patents.
US3587405A
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Indicating and seal activating device and method
Assignee: Ltv Electrosystems Inc
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Filing: 1968-11-29
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Granted: 1971-06-28
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Expires: 1988-11-29
Abstract
Abstract A DEVICE AND METHOD USEFUL IN CONJUNCTION WITH A HYDRAULIC ACTUATOR FOR PROVIDING A SIGNAL TO INDICATE THAT A SEAL OF THE ACTUATOR HAS LEAKED FLUID AT AN EXCESSIVE RATE AND FOR FUNCTIONALLY REPLACING SUCH SEAL WITH A SECONDARY SEAL, WHICH SECONDARY SEAL IS MAINTAINED SUBSTANTIALLY INACTIVE IN THE FLUID CIRCUIT UNTIL FLUID LEAKAGE PAST THE PRIMARY SEAL EXCEEDS A PREDETERMINED AMOUNT.
Inventors
- 👤 Lloyd H Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:14
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2876; F; F15; F15B; F15B20/00; F15B20/005; F16; F16K; F16K43/00; Y; Y10; Y10S; Y10S277/00; Y10S277/914; Y10S277/929
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |