Patent US3531087A successfully refreshed from Google Patents.
US3531087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically actuated winch mechanism
Assignee: WILSON-WICHITA Inc
•
Filing: 1969-04-09
•
Granted: 1970-09-29
•
Expires: 1989-04-09
Abstract
No abstract record available.
Inventors
- 👤 John Hart Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:04
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/02; B66D1/08; B63; B63B; B63B21/00; B63B21/16; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1577; Y10T74/1581; Y10T74/1582
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |