US2758836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door-operators
Assignee: Individual
•
Filing: 1952-05-31
•
Granted: 1956-08-14
•
Expires: 1972-05-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Purdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:22
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/40; E05F15/60; E05F15/603; E05F15/665; E05F15/668; E05F15/681; E05F15/686; E05Y; E05Y2400/00; E05Y2400/10; E05Y2400/32; E05Y2400/35; E05Y2400/354; E05Y2400/50; E05Y2400/51; E05Y2400/61; E05Y2400/80; E05Y2400/81; E05Y2400/818; E05Y2400/822; E05Y2400/83; E05Y2900/00; E05Y2900/10; E05Y2900/106
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1131832A
Cited
US1370111A
Cited
US1725963A
Cited
US1928698A
Cited
US1775755A
Cited
US1874903A
Cited
US1745990A
Cited
US1935017A
Cited
US1906677A
Cited
US1915422A
Cited
US2001416A
Cited
US2048514A
Cited
US2221216A
Cited
US2401082A
Cited
US2607586A
Cited
US2542432A
Cited
US2572785A
Cited
US2588879A
Cited
US2558032A
Cited
US2703235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |