Patent US3606560A successfully refreshed from Google Patents.
US3606560A
Expired / Lapsed
US
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Drill
Assignee: Individual
•
Filing: 1970-07-01
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Granted: 1971-09-20
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Expires: 1990-07-01
Abstract
Abstract AN IMPROVED DRILL INCLUDES A BODY HAVING A FIRST PASSAGE THERETHROUGH FOR CONDUCTING FLUID AND AN EXTRUDED TUNGSTEN CARBIDE CUTTING TIP HAVING A SECOND PASSAGE THERETHROUGH FORMING A CONTINUATION OF THE FIRST PASSAGE. THE SECOND PASSAGE HAS A CROSS-SECTIONAL AREA WHICH IS NO GREATER THAN THE CROSS-SECTIONAL AREA OF THE FIRST PASSAGE AND WHICH IS MORE THAN ONE AND A HALF TIMES AS GREAT AS THE AREA OF A CIRCLE HAVING A DIAMETER EQUAL TO THE WIDTH OF THE CROSS SECTION OF THE SECOND PASSAGE.
Inventors
- 👤 Morton Mcclennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:58
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0486; B23B51/06; B23B51/063; B23B51/066; Y; Y10; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |