Patent US2818753A successfully refreshed from Google Patents.
US2818753A
Expired / Lapsed
US
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Reverse taper boring tool
Assignee: Individual
•
Filing: 1956-08-20
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Granted: 1958-01-07
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Expires: 1976-08-20
Abstract
No abstract record available.
Inventors
- 👤 Guy O Leggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:26
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0018; B23B51/0045; Y; Y10; Y10T; Y10T408/00; Y10T408/83; Y10T408/85; Y10T408/858; Y10T408/8595; Y10T82/00; Y10T82/12; Y10T82/125; Y10T82/128; Y10T82/15; Y10T82/152
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |