Patent FR713082A successfully refreshed from Google Patents.
Patent US2027423A successfully refreshed from Google Patents.
US2027423A
Expired / Lapsed
US
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Doorcheck
Assignee: Individual
•
Filing: 1934-06-29
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Granted: 1936-01-14
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Expires: 1954-06-29
Abstract
No abstract record available.
Inventors
- 👤 George W Gardiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:27
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/14; E05F5/00; E05F5/003; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/21; E05Y2201/252; E05Y2201/254; E05Y2201/256; E05Y2201/262; E05Y2201/266; E05Y2201/40; E05Y2201/404; E05Y2201/422; E05Y2201/424
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-01-13 | 1939-07-15 | 1940-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-01-13 | 1943-07-15 | 1944-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-01-13 | 1947-07-15 | 1948-01-14 | $7700.00 | Window Closed / Lapsed |