Patent US2650535A successfully refreshed from Google Patents.
US2650535A
Expired / Lapsed
US
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Ventilating and air circulating device
Assignee: Individual
•
Filing: 1950-07-28
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Granted: 1953-09-01
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Expires: 1970-07-28
Abstract
No abstract record available.
Inventors
- 👤 Paul E Hord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:44
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/522; F04D29/526; F24; F24F; F24F7/00; F24F7/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2008965A
Cited
US2378012A
Cited
US2294399A
Cited
US2441737A
Cited
US2435645A
Cited
US2488306A
Cited
US2448671A
Cited
US2547189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |