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US1970628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve operating mechanism
Assignee: C S ENGINEERING CO
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Filing: 1931-10-06
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Granted: 1934-08-21
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Expires: 1951-10-06
Abstract
No abstract record available.
Inventors
- 👤 Eugene L Schellens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:44
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/56
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) | 1937-08-20 | 1938-02-19 | 1938-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-08-20 | 1942-02-19 | 1942-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-08-20 | 1946-02-19 | 1946-08-21 | $7700.00 | Window Closed / Lapsed |