Patent US2123539A successfully refreshed from Google Patents.
US2123539A
Expired / Lapsed
US
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Doorknob
Assignee: Emhart Industries Inc
•
Filing: 1938-03-01
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Granted: 1938-07-12
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Expires: 1958-03-01
Abstract
No abstract record available.
Inventors
- 👤 Sigurd P Morgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:28
CPC Classifications
E; E05; E05B; E05B1/00; E05B1/0007; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53909; Y10T29/53943; Y10T292/00; Y10T292/82
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) | 1941-07-11 | 1942-01-10 | 1942-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-07-11 | 1946-01-10 | 1946-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-07-11 | 1950-01-10 | 1950-07-12 | $7700.00 | Window Closed / Lapsed |