US2629531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency fire escape system
Assignee: Individual
•
Filing: 1947-03-22
•
Granted: 1953-02-24
•
Expires: 1967-03-22
Abstract
No abstract record available.
Inventors
- 👤 Hakkarinen William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:49
CPC Classifications
A; A62; A62B; A62B1/00; E; E06; E06C; E06C9/00; E06C9/06; E06C9/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US267286A
Cited
US311805A
Cited
US409511A
Cited
US487569A
Cited
US495503A
Cited
US554515A
Cited
US1316604A
Cited
US635539A
Cited
US993368A
Cited
US1015123A
Cited
US1125918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |