US1922874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating mechanism for valves
Assignee: Semet Solvay Engineering Corp
•
Filing: 1929-03-23
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Granted: 1933-08-15
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Expires: 1949-03-23
Abstract
No abstract record available.
Inventors
- 👤 Sybren R Tymstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:20
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/14; F16K31/143
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) | 1936-08-14 | 1937-02-13 | 1937-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-14 | 1941-02-13 | 1941-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-14 | 1945-02-13 | 1945-08-15 | $7700.00 | Window Closed / Lapsed |