Patent US2995077A successfully refreshed from Google Patents.
US2995077A
Expired / Lapsed
US
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Ventilating system
Assignee: Individual
•
Filing: 1957-09-30
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Granted: 1961-08-08
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Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Kitson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:22
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/77
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US574619A
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US1138470A
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US1153067A
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US1929776A
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US2014840A
Cited
US2126497A
Cited
US2212050A
Cited
US2164608A
Cited
US2620126A
Cited
US2787207A
Cited
US2729389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |