Patent US2948957A successfully refreshed from Google Patents.
US2948957A
Expired / Lapsed
US
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Manufacture of metal stock having internal holes
Assignee: Vanadium Alloys Steel Co
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Filing: 1956-03-26
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Granted: 1960-08-16
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Expires: 1976-03-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles F Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:38
CPC Classifications
B; B21; B21K; B21K5/00; B21K5/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2021945A
Cited
US2093722A
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US2300353A
Cited
US2541849A
Cited
US2628417A
Cited
US2669008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |