Patent US2885941A successfully refreshed from Google Patents.
US2885941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portlight and skylight ventilator
Assignee: Individual
•
Filing: 1956-04-30
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Granted: 1959-05-12
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Expires: 1976-04-30
Abstract
No abstract record available.
Inventors
- 👤 George H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:14
CPC Classifications
B; B63; B63J; B63J2/00; B63J2/02; B63J2/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US813737A
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US1028160A
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US1369099A
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US1568373A
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US1975316A
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US2286584A
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US2476368A
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US2550353A
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US2711126A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |