Patent US2693100A successfully refreshed from Google Patents.
US2693100A
Expired / Lapsed
US
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Safety manhole cover lock
Assignee: Individual
•
Filing: 1950-06-06
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Granted: 1954-11-02
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Expires: 1970-06-06
Abstract
No abstract record available.
Inventors
- 👤 Charles B Wiegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14; E02D29/1427; E02D29/1463; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0886; Y10T292/0887; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/554; Y10T70/5562; Y10T70/5575; Y10T70/558; Y10T70/5584; Y10T70/70; Y10T70/7441; Y10T70/7768
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1210197A
Cited
US1224534A
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US1250495A
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US1430760A
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US1553639A
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US1784551A
Cited
US1902731A
Cited
US2031885A
Cited
US2246344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |