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US2021827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doorlock
Assignee: Individual
•
Filing: 1935-01-31
•
Granted: 1935-11-19
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Expires: 1955-01-31
Abstract
No abstract record available.
Inventors
- 👤 Ross L Benson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:58
CPC Classifications
E; E05; E05B; E05B55/00; Y; Y10; Y10S; Y10S292/00; Y10S292/62; Y10S70/00; Y10S70/73; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0994; Y10T292/96; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/5385; Y10T70/5389; Y10T70/5394; Y10T70/5398; Y10T70/5465; Y10T70/5469; Y10T70/5473; Y10T70/5491
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) | 1938-11-18 | 1939-05-20 | 1939-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-18 | 1943-05-20 | 1943-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-18 | 1947-05-20 | 1947-11-19 | $7700.00 | Window Closed / Lapsed |