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US3531957A
Expired / Lapsed
US
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Door locking system
Assignee: Trico Products Corp
•
Filing: 1968-08-19
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Granted: 1970-10-06
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Expires: 1988-08-19
Abstract
No abstract record available.
Inventors
- 👤 Neil A Gowans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:59
CPC Classifications
E; E05; E05B; E05B77/00; E05B77/46; E05B77/50; Y; Y10; Y10T; Y10T70/00; Y10T70/60; Y10T70/625; Y10T70/65
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2493377A
Cited
US2877795A
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US2918042A
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US3019848A
Cited
US2974742A
Cited
US3198083A
Cited
US3357215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |