Patent US3198269A successfully refreshed from Google Patents.
US3198269A
Expired / Lapsed
US
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Rotary drill bit nonreturn valve assembly
Assignee: Individual
•
Filing: 1963-03-21
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Granted: 1965-08-03
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Expires: 1983-03-21
Abstract
No abstract record available.
Inventors
- 👤 Nickles Freddie Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:16
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/18; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A ROTARY DRILL BIT HAVING A UNITARY BODY THROUGH WHICH A LONGITUDINAL PASSAGE FOR DRILLING FLUID EXTENDS, ROTARY CUTTERS JOURNALLED ON THE LOWER END PORTION OF THE UNITARY BODY AND EXTENDING INWARDLY INTO THE LOWER PORTION OF THE PASSAGE SO AS TO PARTIALLY OBSTRUCT SAID PASSAGE, SAID UNITARY BODY HAVING SEPARATE FLUID COURSES EXTENDING DOWNWARDLY FROM THE UPPER PORTION OF SAID PASSAGE TO THE INTERIORS OF THE ROTARY CUTTERS FOR CONDUCTING DRILLING FLUID THERETO, SUPPORT MEANS EXTENDING TRANSVERSELY OF SAID PASSAGE BETWEEN SAID ROTARY CUTTERS AND THE UPPER
Claim 2
Dependent Claim
89 words
IN A ROTARY DRILL BIT HAVING A UNITARY BODY THROUGH WHICH A LONGITUDINAL PASSAGE FOR DRILLING FLUID EXTENDS, ROTARY CUTTERS JOURNALLED ON THE LOWER END PORTION OF THE UNITARY BODY AND EXTENDING INWARDLY INTO THE LOWER PORTION OF THE PASSAGE SO AS TO PARTIALLY OBSTRUCT SAID PASSAGE, SAID UNITARY BODY HAVING SEPARATE FLUID COURSES EXTENDING DOWNWARDLY FROM THE UPPER PORTION OF SAID PASSAGE TO THE INTERIORS OF THE ROTARY CUTTERS FOR CONDUCTING DRILLING FLUID THERETO, SUPPORT MEANS EXTENDING TRANSVERSELY OF SAID PASSAGE BETWEEN SAID ROTARY CUTTERS AND THE UPPER
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |