US3570330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of machining involving progressive step tool change
Assignee: Individual
•
Filing: 1968-12-23
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Granted: 1971-03-16
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Expires: 1988-12-23
Abstract
Abstract THE DISCLOSURE RELATED TO A METHOD OF DRILLING WHEREIN SUCCESSIVELY LONGER COUNTERSINKING AND COUNTERBORING TOOLS ARE UTILIZED TO EXTEND THE LENGTH OF A BORE INITIALLY FORMED BY A TOOL WHICH IS RELATIVELY SHORT IN COMPARISON TO THE DEPTH OF DRILLING OPERATION TO BE PERFORMED.
Inventors
- 👤 John A Coupler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:42
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/155; B23Q3/1552; B23Q3/15553; B23B; B23B35/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49995; Y10T29/49996; Y10T408/00; Y10T408/03; Y10T408/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |