Patent US2629531A successfully refreshed from Google Patents.
US2629531A
Expired / Lapsed
US
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Emergency fire escape system
Assignee: Individual
•
Filing: 1947-03-22
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Granted: 1953-02-24
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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 00:58
CPC Classifications
A; A62; A62B; A62B1/00; E; E06; E06C; E06C9/00; E06C9/06; E06C9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US267286A
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US311805A
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US409511A
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US487569A
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US495503A
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US554515A
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US1316604A
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US635539A
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US993368A
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US1015123A
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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 |