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US2908155A
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US
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Safety door latch
Assignee: ALTA ENGINEERING Co
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Filing: 1952-07-29
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Granted: 1959-10-13
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Expires: 1972-07-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Schumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:50
CPC Classifications
E; E05; E05B; E05B85/00; E05B85/08; Y; Y10; Y10T; Y10T292/00; Y10T292/82; Y10T70/00; Y10T70/50; Y10T70/5611; Y10T70/5642
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1335943A
Cited
US1638688A
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US1707231A
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US2235792A
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US2582237A
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US2708845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |