US2670922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Macco Oil Tool Co Inc
•
Filing: 1951-04-07
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Granted: 1954-03-02
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Expires: 1971-04-07
Abstract
No abstract record available.
Inventors
- 👤 Willis C Carlisle
- 👤 John H Mccarvell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:16
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US583668A
Cited
US811185A
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US1302844A
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US1365820A
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US1707660A
Cited
US2234932A
Cited
US2353161A
Cited
US2322139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |