Patent US3516443A successfully refreshed from Google Patents.
US3516443A
Expired / Lapsed
US
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Pilot operated valve
Assignee: Ingersoll Rand Co
•
Filing: 1967-11-13
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Granted: 1970-06-23
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Expires: 1987-11-13
Abstract
No abstract record available.
Inventors
- 👤 Robert W Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:51
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663; Y10T137/87169
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2707002A
Cited
US2918906A
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US2816420A
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US3151623A
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US3273468A
Cited
US3360234A
Cited
US3274902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |