US3401759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heel pack rock bit
Assignee: Hughes Tool Co
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Filing: 1966-10-12
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Granted: 1968-09-17
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Expires: 1986-10-12
Abstract
No abstract record available.
Inventors
- 👤 Anderson D White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:43
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
149 words
IN A ROLLING CONE CUTTER FOR ROCK BITS HAVING A CONICAL MAIN-BOTTOM CUTTING SURFACE, A CONICAL HEEL CUTTING SURFACE AND A CONICAL GAGE SURFACE, AND ANNULAR ROWS OF STEEL TEETH EXTENDING FROM THE CUTTER WITH THEIR CRESTS FORMING SAID CUTTING SURFACES, INCLUDING A ROW OF ELEMENTALLY CRESTED HEEL TEETH, THE IMPROVEMENT COMPRISING DIVIDING SAID HEEL TEETH INTO A FIRST SUBSTANTIAL NUMBER WHICH EXTEND TO SAID GAGE SURFACE AND ARE THERE PROVIDED WITH A WELDED-ON HARDFACING OF TUNGSTEN CARBIDE, AND A SECOND SUBSTANTIAL NUMBER HAVING AT LEAST THEIR PORTIONS ADJACENT SAID GAGE SURFACE CUT AWAY TO DEFINE SPACES ADJACENT SUCH SURFACE, AND WEAR RESISTANT INSERTS OF TUNGSTEN CARBIDE SECURED IN THE CUTTER AT SUCH SPACES SO THAT THEIR CUTTING TIPS EXTEND TOWARD SAID GAGE AND HEEL SURFACES, SAID CUTTING TIPS EXTENDING FROM THE CUTTER AND TERMINATING SHORT OF SAID HEEL CUTTING SURFACE AND BEING GROUND FLUSH WITH THE GAGE SURFACE.
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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |