Patent US2138528A successfully refreshed from Google Patents.
US2138528A
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Method of forming a valve
Assignee: Eaton Corp
•
Filing: 1933-01-23
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Granted: 1938-11-29
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Expires: 1953-01-23
Abstract
No abstract record available.
Inventors
- 👤 Goddie F Phillipps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:17
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/20; B21K1/22; B21C; B21C23/00; B21C23/02; B21C23/04; B21C23/14; B21C23/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307; Y10T29/49309; Y10T29/49311
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) | 1941-11-28 | 1942-05-30 | 1942-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-11-28 | 1946-05-30 | 1946-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-11-28 | 1950-05-30 | 1950-11-29 | $7700.00 | Window Closed / Lapsed |