Patent US2862657A successfully refreshed from Google Patents.
US2862657A
Expired / Lapsed
US
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Multiple purpose ventilator and air circulator
Assignee: General Electric Co
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Filing: 1955-06-13
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Granted: 1958-12-02
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Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 William M Copeland
- 👤 Alfred W Wakeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:23
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/701; F04D29/703
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733002A
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US1935179A
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DE625522C
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US2215035A
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US2325754A
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US2644390A
Cited
US2620127A
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US2804817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |