Patent US2898670A successfully refreshed from Google Patents.
US2898670A
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US
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Helical broach
Assignee: Nachi Machining Technology Co
•
Filing: 1955-12-05
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Granted: 1959-08-11
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Expires: 1975-12-05
Abstract
No abstract record available.
Inventors
- 👤 Pernack Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:13
CPC Classifications
B; B23; B23F; B23F21/00; B23F21/26; B23D; B23D43/00; B23D43/005; Y; Y10; Y10T; Y10T407/00; Y10T407/16; Y10T407/1671
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1806552A
Cited
US1376709A
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US1551036A
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US2011630A
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US2060889A
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US2078632A
Cited
US2199343A
Cited
US2398310A
Cited
US2683919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |