US2253170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door operating mechanism
Assignee: General Electric Co
•
Filing: 1939-08-25
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Granted: 1941-08-19
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Expires: 1959-08-25
Abstract
No abstract record available.
Inventors
- 👤 George W Dunham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:51
CPC Classifications
E; E05; E05F; E05F17/00; E05F17/004; E05F15/00; E05F15/60; E05F15/603; E05F15/611; E05F15/616; E05F15/622; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/47; E05Y2201/474; E05Y2400/00; E05Y2400/10; E05Y2400/32; E05Y2400/33; E05Y2400/332; E05Y2400/52; E05Y2400/53; E05Y2400/54; E05Y2400/55; E05Y2400/552; E05Y2800/00; E05Y2800/20; E05Y2800/21; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
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) | 1944-08-18 | 1945-02-17 | 1945-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-18 | 1949-02-17 | 1949-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-18 | 1953-02-17 | 1953-08-19 | $7700.00 | Window Closed / Lapsed |