Patent US2436928A successfully refreshed from Google Patents.
US2436928A
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Method of and apparatus for making poppet valves
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1944-09-02
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Granted: 1948-03-02
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Expires: 1964-09-02
Abstract
No abstract record available.
Inventors
- 👤 Robert A Kempe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:04
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/10; F; F01; F01L; F01L3/00; F01L3/02; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C2223/00; F16C2223/02; F16C2223/08; Y; Y10; Y10T; Y10T29/00; Y10T29/47
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1784866A
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US1949592A
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US1987234A
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US2077639A
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US2272686A
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US2248530A
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US2351272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |