Patent US2942841A successfully refreshed from Google Patents.
US2942841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide valve
Assignee: Individual
•
Filing: 1957-12-13
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Granted: 1960-06-28
•
Expires: 1977-12-13
Abstract
No abstract record available.
Inventors
- 👤 Crawford K Stillwagon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:41
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0263; F16K27/00; F16K27/04; F16K27/044; F16K3/0281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US72340A
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US2732170A
Cited
US776900A
Cited
US1106933A
Cited
US1779503A
Cited
US2329315A
Cited
US2669416A
Cited
US2731231A
Cited
GB693257A
Cited
US2774371A
Cited
US2829862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |