US2772439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connection for doorchecks
Assignee: LCN CLOSERS Inc
•
Filing: 1955-03-11
•
Granted: 1956-12-04
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Expires: 1975-03-11
Abstract
No abstract record available.
Inventors
- 👤 Russell C Flint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:43
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/22; E05F2003/228; E05Y; E05Y2600/00; E05Y2600/40; E05Y2600/41; E05Y2600/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1921314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |