Patent US3408841A successfully refreshed from Google Patents.
US3408841A
Expired / Lapsed
US
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Safety lock mechanism
Assignee: SAM SHIAO MING HSU
•
Filing: 1966-03-08
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Granted: 1968-11-05
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Expires: 1986-03-08
Abstract
No abstract record available.
Inventors
- 👤 Hsu Sam Shiao-Ming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:36
CPC Classifications
E; E05; E05B; E05B37/00; E05B37/0031; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7141; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7667; Y10T70/7706; Y10T70/7774; Y10T70/7915; Y10T70/7955; Y10T70/7966
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US874438A
Cited
US1092474A
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US1113193A
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US1899876A
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US1937523A
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US1937165A
Cited
US1946364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |