Patent US2640494A successfully refreshed from Google Patents.
US2640494A
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Reverse cycle valve
Assignee: Alco Valve Co
•
Filing: 1947-01-09
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Granted: 1953-06-02
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Expires: 1967-01-09
Abstract
No abstract record available.
Inventors
- 👤 Edward F Kounovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:57
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879; Y10T137/86895; Y10T137/87265; Y10T137/8741; Y10T137/87491; Y10T137/877; Y10T137/87708; Y10T137/87748
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US658797A
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US728611A
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US765867A
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US2019193A
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US2040163A
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US2280518A
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US2505710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |