US3147646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Special purpose drill
Assignee: Universal American Corp
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Filing: 1961-10-19
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Granted: 1964-09-08
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Percy Rawcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:54
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/02; B23B2251/00; B23B2251/24; B23B2251/241; B23B2251/44; B23B2251/48; B23B2260/00; B23B2260/072; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/909; Y10T408/9095; Y10T408/9097
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A DRILL HAVING A POINT SECTION AND AN ASSOCIATED FLUTE SECTION EXTENDING REARWARDLY THEREFROM AND COMPRISING AT LEAST ONE HELICAL LAND AND AT LEAST ONE FLUTE DEFINING LEADING AND TRAILING EDGES OF THE LAND, SAID LAND HAVING AN AXIALLY SPACED SERIES OF GROOVES THEREIN WHICH EXTEND FROM THE LEADING EDGE OF THE LAND AT REARWARD ANGLES WITH RESPECT TO RADIAL PLANES AND WHICH COLLECTIVELY FORM A SCREW THREAD, EACH OF SAID GROOVES COMMUNICATING WITH THE FLUTE AT THE LEADING AND TRAILING EDGES OF THE LAND WHEREBY SAID GROOVES COLLECTIVELY DEFINE A SERIES OF SMALL CUTTING EDGES ALONG SAID LEADING EDGE AND SERVE AS AUXILIARY FLUTES FOR SAID CUTTING EDGES AND SUBSTANTIALLY ALL OF THE THREADS OF SAID SCREW THREAD HAVING A MAXIMUM DIAMETER EQUAL TO THE MAXIMUM DIAMETER OF THE DRILL AT ITS SAID POINT SECTION.
Claim 2
Dependent Claim
136 words
A DRILL HAVING A POINT SECTION AND AN ASSOCIATED FLUTE SECTION EXTENDING REARWARDLY THEREFROM AND COMPRISING AT LEAST ONE HELICAL LAND AND AT LEAST ONE FLUTE DEFINING LEADING AND TRAILING EDGES OF THE LAND, SAID LAND HAVING AN AXIALLY SPACED SERIES OF GROOVES THEREIN WHICH EXTEND FROM THE LEADING EDGE OF THE LAND AT REARWARD ANGLES WITH RESPECT TO RADIAL PLANES AND WHICH COLLECTIVELY FORM A SCREW THREAD, EACH OF SAID GROOVES COMMUNICATING WITH THE FLUTE AT THE LEADING AND TRAILING EDGES OF THE LAND WHEREBY SAID GROOVES COLLECTIVELY DEFINE A SERIES OF SMALL CUTTING EDGES ALONG SAID LEADING EDGE AND SERVE AS AUXILIARY FLUTES FOR SAID CUTTING EDGES AND SUBSTANTIALLY ALL OF THE THREADS OF SAID SCREW THREAD HAVING A MAXIMUM DIAMETER EQUAL TO THE MAXIMUM DIAMETER OF THE DRILL AT ITS SAID POINT SECTION.
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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |