US3418833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamperproof cylinder lock
Assignee: Chicago Lock Co
•
Filing: 1966-08-15
•
Granted: 1968-12-31
•
Expires: 1986-08-15
Abstract
No abstract record available.
Inventors
- 👤 William J Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:58
CPC Classifications
E; E05; E05B; E05B29/00; E05C; E05C3/00; E05C3/02; E05C3/04; E05C3/041; E05C3/042; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7768; Y10T70/778; Y10T70/7791; Y10T70/7842; Y10T70/7859; Y10T70/7864; Y10T70/7915; Y10T70/7932; Y10T70/7944
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US419091A
Cited
US758024A
Cited
US1835725A
Cited
US1915897A
Cited
US2145085A
Cited
GB639171A
Cited
US2857753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |