US2963956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof ventilator
Assignee: JAMES B SHAVER
•
Filing: 1957-05-10
•
Granted: 1960-12-13
•
Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Francis U Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:46
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F7/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1127643A
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US1573254A
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US1793038A
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US1841759A
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US2052475A
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US2272928A
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US2439271A
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US2673514A
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US2651987A
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US2668491A
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US2770386A
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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) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |