Patent US2731708A successfully refreshed from Google Patents.
US2731708A
Expired / Lapsed
US
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Process for manufacture of hollow poppet valves especially for internal-combustion engines
Assignee: Continental Teves AG and Co OHG
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Filing: 1953-04-27
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Granted: 1956-01-24
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 Kubera Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:26
CPC Classifications
B; B21; B21J; B21J5/00; B21C; B21C1/00; B21C1/16; B21C1/18; B21C1/22; B21K; B21K1/00; B21K1/20; B21K1/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307; Y10T29/49309; Y10T29/4981
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1568369A
Cited
US1714690A
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US2093773A
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US2217193A
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US2452636A
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US2498275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |