US2486608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse cycle device
Assignee: Alco Valve Co
•
Filing: 1946-06-03
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Granted: 1949-11-01
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Expires: 1966-06-03
Abstract
No abstract record available.
Inventors
- 👤 Franklin M Macdougall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:01
CPC Classifications
F; F25; F25B; F25B13/00; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7866; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726; Y10T137/87265; Y10T137/87555; Y10T137/87563; Y10T137/87917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-31 | 1953-05-02 | 1953-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-31 | 1957-05-02 | 1957-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-31 | 1961-05-02 | 1961-11-01 | $7700.00 | Window Closed / Lapsed |