Patent US2991901A successfully refreshed from Google Patents.
US2991901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically actuated fabric seal with pull-down and push-out mechanism
Assignee: Individual
•
Filing: 1959-07-10
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Granted: 1961-07-11
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Expires: 1979-07-10
Abstract
No abstract record available.
Inventors
- 👤 John H Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:48
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/34; B65D88/42; B65D88/46; F; F17; F17B; F17B1/00; F17B1/02; F17B1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735573A
Cited
CH94546A
Cited
US1831020A
Cited
US2092877A
Cited
US2531424A
Cited
US2537986A
Cited
US2516101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |