Patent US2579662A successfully refreshed from Google Patents.
US2579662A
Expired / Lapsed
US
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Ventilating device
Assignee: Individual
•
Filing: 1949-09-24
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Granted: 1951-12-25
•
Expires: 1969-09-24
Abstract
No abstract record available.
Inventors
- 👤 Gibson Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:35
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; E; E04; E04D; E04D13/00; E04D13/17; E04D13/174
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US111163A
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US1124875A
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US1359551A
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US1441070A
Cited
GB299171A
Cited
US2214183A
Cited
US2147240A
Cited
GB518399A
Cited
US2416284A
Cited
US2445548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |