Patent US3130801A successfully refreshed from Google Patents.
US3130801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit having inserts forming a reamer
Assignee: Reed Roller Bit Co
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Filing: 1961-02-09
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Granted: 1964-04-28
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Expires: 1981-02-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Percy W Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:39
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
IN A WELL DRILL USEFUL FOR DRILLING HARD ABRASIVE FORMATIONS, A BIT HEAD HAVING A PLURALITY OF DOWNWARDLY EXTENDING ROLLER CUTTER SUPPORTING LEGS, AN INWARDLY AND DOWNWARDLY EXTENDING SHAFT ON EACH OF SAID LEGS, A ROLLER CUTTER MOUNTED ON EACH OF SAID SHAFTS, THE OUTBOARD PORTION OF THE SAID LEG WHICH FACES THE SIDE WALL OF THE BOREHOLE BEING DRILLED HAVING THEREIN OUTWARDLY OPEN SPACED SOCKETS, A PLURALITY OF SINTERED TUNGSTEN CARBIDE BALLS MOVABLE IN SAID SOCKETS AND ARRANGED TO PROTRUDE OUTWARDLY BEYOND THE SURFACE OF SAID LEG WHICH FACES THE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |