Patent US2738166A successfully refreshed from Google Patents.
US2738166A
Expired / Lapsed
US
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Diamond drilling bits
Assignee: Reed Roller Bit Co
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Filing: 1952-10-15
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Granted: 1956-03-13
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Expires: 1972-10-15
Abstract
No abstract record available.
Inventors
- 👤 William M Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:45
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48; E21B10/02; E21B10/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A DIAMOND BIT HAVING A BIT BODY WITH AN ANNULAR CUTTING SURFACE FOR CUTTING AN ANNULAR PATH IN A WELL BORE LEAVING AN UNCUT CENTRAL CORE, SAID BODY HAVING AN AXIAL CENTRAL OPENING INTO WHICH THE UNCUT CENTRAL CORE IS ADAPTED TO EXTEND, AN AUXILIARY CENTRAL CUTTER WITHIN SAID AXIAL OPENING ADAPTED TO CONTACT SAID UNCUT CENTRAL CORE, AN ANNULAR TRACK WITHIN SAID AXIAL OPENING OF SAID BIT BODY, ONE END OF SAID AUXILIARY CUTTER FITING INTO SAID TRACK, AND THE OTHER END OF SAID AUXILIARY CUTTER BEING CONNECTED TO SAID BIT BODY THROUGH A UNIVERSAL CONNECTION, WHEREBY UPON CONTACT OF SAID CUTTER WITH SAID CENTRAL UNCUT CORE ROTATIONAL MOVEMENT OF SAID BIT BODY EFFECTS A ROTATION OF SAID AUXILIARY CUTTER ABOUT ITS OWN AXIS.
Claim 2
Dependent Claim
125 words
A DIAMOND BIT HAVING A BIT BODY WITH AN ANNULAR CUTTING SURFACE FOR CUTTING AN ANNULAR PATH IN A WELL BORE LEAVING AN UNCUT CENTRAL CORE, SAID BODY HAVING AN AXIAL CENTRAL OPENING INTO WHICH THE UNCUT CENTRAL CORE IS ADAPTED TO EXTEND, AN AUXILIARY CENTRAL CUTTER WITHIN SAID AXIAL OPENING ADAPTED TO CONTACT SAID UNCUT CENTRAL CORE, AN ANNULAR TRACK WITHIN SAID AXIAL OPENING OF SAID BIT BODY, ONE END OF SAID AUXILIARY CUTTER FITING INTO SAID TRACK, AND THE OTHER END OF SAID AUXILIARY CUTTER BEING CONNECTED TO SAID BIT BODY THROUGH A UNIVERSAL CONNECTION, WHEREBY UPON CONTACT OF SAID CUTTER WITH SAID CENTRAL UNCUT CORE ROTATIONAL MOVEMENT OF SAID BIT BODY EFFECTS A ROTATION OF SAID AUXILIARY CUTTER ABOUT ITS OWN AXIS.
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) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |