US2813279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hexagon socket type cup point set screw blanks
Assignee: National Machinery Co
•
Filing: 1953-08-14
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Granted: 1957-11-19
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Expires: 1973-08-14
Abstract
No abstract record available.
Inventors
- 👤 Robert G Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:50
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1388566A
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US1832164A
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US1978371A
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US1978372A
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US2239352A
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US2294802A
Cited
US2396995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |