US2515231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve arrangement
Assignee: WETHERILL ENGINEERING Co
•
Filing: 1944-06-12
•
Granted: 1950-07-18
•
Expires: 1964-06-12
Abstract
No abstract record available.
Inventors
- 👤 Martin H Kalina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:22
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US674840A
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US930989A
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US1009400A
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US1084277A
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US1354286A
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US1703739A
Cited
US1987666A
Cited
US2138527A
Cited
US2140607A
Cited
US2232267A
Cited
US2338098A
Cited
US2289484A
Cited
US3379401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |