Patent US2320476A successfully refreshed from Google Patents.
US1789388A
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Combined check valve and unloader
Assignee: AIR O MATIC Manufacturing Co
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Filing: 1926-11-27
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Granted: 1931-01-20
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Expires: 1946-11-27
Abstract
No abstract record available.
Inventors
- 👤 James O Mcmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:58
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/067; F16K17/00; F16K17/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/2582; Y10T137/2584; Y10T137/2587; Y10T137/2605; Y10T137/2612; Y10T137/2615; Y10T137/7722; Y10T137/7781; Y10T137/7832; Y10T137/7837; Y10T137/785; Y10T137/7852; Y10T137/7853
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-01-19 | 1934-07-21 | 1935-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-19 | 1938-07-21 | 1939-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-19 | 1942-07-21 | 1943-01-20 | $7700.00 | Window Closed / Lapsed |