US2939308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety door locks
Assignee: Individual
•
Filing: 1957-02-04
•
Granted: 1960-06-07
•
Expires: 1977-02-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Earl M Trammell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:24
CPC Classifications
E; E05; E05B; E05B13/00; E05B13/10; E05B13/106; Y; Y10; Y10T; Y10T292/00; Y10T292/57; Y10T70/00; Y10T70/50; Y10T70/5611; Y10T70/5757; Y10T70/5765; Y10T70/577; Y10T70/5774; Y10T70/5792
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US156932A
Cited
US861421A
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US956947A
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US2105912A
Cited
US2254007A
Cited
US2255418A
Cited
US2525340A
Cited
US2547108A
Cited
US2629246A
Cited
US2620213A
Cited
US2708845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |