Patent US2754571A successfully refreshed from Google Patents.
US2754571A
Expired / Lapsed
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Method of making a two-headed valve stem
Assignee: Alco Valve Co
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Filing: 1950-12-01
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Granted: 1956-07-17
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Expires: 1970-12-01
Abstract
No abstract record available.
Inventors
- 👤 Oscar C Steffens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:07
CPC Classifications
B; B21; B21J; B21J9/00; B21J9/02; B21J9/06; B21K; B21K1/00; B21K1/20; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/4941; Y10T29/49826; Y10T29/4984; Y10T29/49861
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1873619A
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US1995451A
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US2241747A
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US2544209A
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US2577654A
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US2536727A
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US2504428A
Cited
US2598868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |