US2431853A
Expired / Lapsed
US
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Method of making composite poppet valves
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1945-12-29
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Granted: 1947-12-02
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Expires: 1965-12-29
Abstract
No abstract record available.
Inventors
- 👤 Wischhusen John
- 👤 Jr George D Dolch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:33
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/20; B21K1/22; B21K25/00; B23; B23K; B23K5/00; B23K5/18; Y; Y10; Y10S; Y10S411/00; Y10S411/914; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307; 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) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |