Patent US3002614A successfully refreshed from Google Patents.
US2936692A
Expired / Lapsed
US
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Ventilation system for buildings
Assignee: CHARLES M SUGAR
•
Filing: 1955-05-23
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Granted: 1960-05-17
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Expires: 1975-05-23
Abstract
No abstract record available.
Inventors
- 👤 Ray C White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/12; F24F7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US780247A
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US1729036A
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US1874083A
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US1981051A
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US1855294A
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US2281370A
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US2360343A
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US2767961A
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US2718187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |