US2500000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlock for quick fastening doors
Assignee: Heintz Manufacturing Co
•
Filing: 1946-12-06
•
Granted: 1950-03-07
•
Expires: 1966-12-06
Abstract
No abstract record available.
Inventors
- 👤 Francis M Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:57
CPC Classifications
E; E05; E05C; E05C9/00; E05C9/06; E05C9/10; E05C9/16; Y; Y10; Y10T; Y10T292/00; Y10T292/54; Y10T292/558
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |