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US2820972A
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US
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Method of stamping screw threaded fasteners from flat bar stock
Assignee: Individual
•
Filing: 1954-05-24
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Granted: 1958-01-28
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Expires: 1974-05-24
Abstract
No abstract record available.
Inventors
- 👤 Wilbur F Ptak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:57
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/24; Y; Y10; Y10S; Y10S411/00; Y10S411/919
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US138413A
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US1949618A
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US1200689A
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US1284989A
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US1928549A
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US2302621A
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GB650741A
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US2649125A
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US2684094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |