US1930554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve mechanism
Assignee: General Motors Research Corp
•
Filing: 1927-01-10
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Granted: 1933-10-17
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Expires: 1947-01-10
Abstract
No abstract record available.
Inventors
- 👤 George E A Hallett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:15
CPC Classifications
F; F01; F01L; F01L9/00; F01L9/10; F01L9/11; F01L9/12; F01L1/00; F01L1/34; F01L1/344; F01L1/3442; F01L2001/34423; F01L2001/34446
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) | 1936-10-16 | 1937-04-17 | 1937-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-16 | 1941-04-17 | 1941-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-16 | 1945-04-17 | 1945-10-17 | $7700.00 | Window Closed / Lapsed |