US3145790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drag bit
Assignee: Jersey Production Research Co
•
Filing: 1963-06-10
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Granted: 1964-08-25
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Expires: 1983-06-10
Abstract
No abstract record available.
Inventors
- 👤 Harold C Bridwell
- 👤 David S Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:38
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A DRAG BIT CUTTING ELEMENT COMPRISING A METALLIC BLADE HAVING A HARD FACING MATERIAL BONDED TO THE FACE THEREOF, SAID HARD FACING MATERIAL BONDED IN PLACE ALONG VERTICALLY-SPACED SURFACES SLOPING DOWNWARDLY TOWARD THE TRAILING EDGE OF SAID BLADE AT AN ANGLE OF FROM ABOUT 5* TO ABOUT 30* TO THE LONGITUDINAL AXIS OF THE BLADE.
Claim 2
Dependent Claim
55 words
A DRAG BIT CUTTING ELEMENT COMPRISING A METALLIC BLADE HAVING A HARD FACING MATERIAL BONDED TO THE FACE THEREOF, SAID HARD FACING MATERIAL BONDED IN PLACE ALONG VERTICALLY-SPACED SURFACES SLOPING DOWNWARDLY TOWARD THE TRAILING EDGE OF SAID BLADE AT AN ANGLE OF FROM ABOUT 5* TO ABOUT 30* TO THE LONGITUDINAL AXIS OF THE BLADE.
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |