Patent US3447347A successfully refreshed from Google Patents.
US3447347A
Expired / Lapsed
US
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Pushbutton combination lock
Assignee: Individual
•
Filing: 1967-11-28
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Granted: 1969-06-03
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Expires: 1987-11-28
Abstract
No abstract record available.
Inventors
- 👤 Yoichi Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
E; E05; E05B; E05B37/00; E05B37/16; E05B37/163; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/5531; Y10T70/5535; Y10T70/5611; Y10T70/5757; Y10T70/5765; Y10T70/577; Y10T70/5783; Y10T70/70; Y10T70/7153; Y10T70/7311; Y10T70/7322; Y10T70/7328; Y10T70/7339
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2640346A
Cited
US3274810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |