US2204638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door opening mechanism
Assignee: LOUIS J FLINT
•
Filing: 1937-05-10
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Granted: 1940-06-18
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Expires: 1957-05-10
Abstract
No abstract record available.
Inventors
- 👤 Warren F Weathers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:58
CPC Classifications
F; F16; F16H; F16H19/00; F16H19/02; F16H19/025; E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/665; E05F15/668; E05F15/676; E05Y; E05Y2201/00; E05Y2201/60; E05Y2201/622; E05Y2201/674; E05Y2800/00; E05Y2900/00; E05Y2900/10; E05Y2900/106; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18072; Y10T74/18296; Y10T74/18304; Y10T74/18312; Y10T74/18328
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) | 1943-06-18 | 1943-12-18 | 1944-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-18 | 1947-12-18 | 1948-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-18 | 1951-12-18 | 1952-06-18 | $7700.00 | Window Closed / Lapsed |