Patent US3572183A successfully refreshed from Google Patents.
US3572183A
Expired / Lapsed
US
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Straight drill
Assignee: Individual
•
Filing: 1968-06-26
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Granted: 1971-03-23
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Expires: 1988-06-26
Abstract
Abstract A ROTARY DRILL FOR DRILLING HOLES IN A WORKPIECE WHEREBY EQUAL AND BALANCED CUTTING PRESSURE IS APPLIED BY THREE SEPARATE CUTTING EDGES DISPOSED AT A CUTTING END OF A SOLID ELONGATED SHANK MEMBER IN EQUALLY SPACED ANGULAR DIRECTIONS AROUND THE DRILLING AXIS, EACH OF THE CUTTING EDGES BEING INCLINED AND SITUATED ALONG THE SAME CONICAL ROTATION SURFACE TO GENERATE ADJACENT ANNULAR ZONES OF THE CONICAL SURFACE.
Inventors
- 👤 Gennaro Mellone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:04
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/892; Y10T408/8928; Y10T408/909
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |