Patent US2131067A successfully refreshed from Google Patents.
US2131067A
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Doorknob and plate
Assignee: JAMES EMERY DUTTON
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Filing: 1937-03-22
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Granted: 1938-09-27
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Expires: 1957-03-22
Abstract
No abstract record available.
Inventors
- 👤 Alonzo E Paden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:34
CPC Classifications
E; E05; E05B; E05B1/00; E05B1/0061; Y; Y10; Y10S; Y10S292/00; Y10S292/02; Y10S292/08; Y10T; Y10T292/00; Y10T292/82; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20732; Y10T74/20876
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) | 1941-09-26 | 1942-03-28 | 1942-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-09-26 | 1946-03-28 | 1946-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-09-26 | 1950-03-28 | 1950-09-27 | $7700.00 | Window Closed / Lapsed |