US3477177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically actuated door operator
Assignee: Otis Elevator Co
•
Filing: 1967-04-18
•
Granted: 1969-11-11
•
Expires: 1987-04-18
Abstract
No abstract record available.
Inventors
- 👤 Benjamin Whitehead Tucker Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:11
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/56; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1047600A
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US1937244A
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US1957697A
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US1970286A
Cited
US2192175A
Cited
US2212998A
Cited
US2246461A
Cited
US2286661A
Cited
US2388755A
Cited
US2927429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |