Patent US2174337A successfully refreshed from Google Patents.
US2174337A
Expired / Lapsed
US
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Method of making flexible valve seats
Assignee: Eaton Corp
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Filing: 1937-09-21
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Granted: 1939-09-26
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Expires: 1957-09-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Welsmiller
- 👤 Schneider Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:32
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/20; B21K1/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49306; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49934
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) | 1942-09-25 | 1943-03-27 | 1943-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-25 | 1947-03-27 | 1947-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-25 | 1951-03-27 | 1951-09-26 | $7700.00 | Window Closed / Lapsed |