Patent US3965960A successfully refreshed from Google Patents.
US3553795A
Expired / Lapsed
US
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Hydraulic latch
Assignee: Vetco Gray Controls Inc
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Filing: 1969-05-05
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Granted: 1971-01-12
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Expires: 1989-05-05
Abstract
Abstract THERE IS PROVIDED A LATCH WHICH IS HYDRAULICALLY OPERATED. THE LATCH COMPRISES A SLEEVE MEMBER ADAPTED TO BE SEPARABLE CONNECTED TO AN ASSEMBLY HAVING A BLADDER MEMBER THAT IS EXPANDABLE OR CONTRACTABLE INSIDE THE SLEEVE MEMBER. A SPRING-BIASED PISTON IS MOUNTED ADJACENT THE SLEEVE THAT IS ACTUATED BY AN ELECTRONIC CONTROL MEANS. BY CONTROLLING THE VOLUME DISPLACEMENT OF A HYDRAULIC SUBSTANCE, THE LATCH IS SELECTIVELY SECURED OR RELEASED.
Inventors
- 👤 Donald E Mcdougal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:46
CPC Classifications
B; B63; B63B; B63B22/00; B63B22/04; B63B22/06; Y; Y10; Y10T; Y10T24/00; Y10T24/45; Y10T24/45225; Y10T24/45466; Y10T24/45471; Y10T24/45482
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |