US2544959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door lock
Assignee: Individual
•
Filing: 1945-08-01
•
Granted: 1951-03-13
•
Expires: 1965-08-01
Abstract
No abstract record available.
Inventors
- 👤 Carl A Hillgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:39
CPC Classifications
E; E05; E05B; E05B55/00; E05B55/005; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0977; Y10T292/0982; Y10T292/0985; Y10T292/0989; Y10T292/099; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/5385; Y10T70/5389; Y10T70/5394; Y10T70/5465; Y10T70/5611; Y10T70/5757; Y10T70/5765; Y10T70/577; Y10T70/5792; Y10T70/5796
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US847884A
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US1796727A
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US2357551A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |