Patent US3147536A successfully refreshed from Google Patents.
US3147536A
Expired / Lapsed
US
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Apparatus for milling tubular strings in well bores
Assignee: Individual
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Filing: 1961-10-27
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Granted: 1964-09-08
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Expires: 1981-10-27
Abstract
No abstract record available.
Inventors
- 👤 David E Lamphere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:14
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/002; Y; Y10; Y10T; Y10T407/00; Y10T407/14; Y10T407/19; Y10T407/1906; Y10T407/1908; Y10T407/192
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
IN APPARATUS FOR MILLING AWAY A TUBULAR CONDUIT DISPOSED IN A WELL BORE: A TUBULAR BODY ADAPTED TO BE SECURED TO A DRILL STRING AND HAVING A FLUID PASSAGE THEREIN; SETS OF CIRCUMFERENTIALLY SPACED CUTTER BLADES CARRIED BY AND EXTENDING GENERALLY RADIALLY OUTWARDLY OF SAID BODY FOR OPERATION UPON AN UPWARDLY FACING END PORTION OF THE TUBULAR CONDUIT; EACH SET COMPRISING LONGITUDINALLY ALIGNED BLADE SEGMENTS SEPARATED FROM ONE ANOTHER BY A SLOT OF SUBSTANTIAL LONGITUDINAL EXTENT TO PROVIDE A WIDE GAP THEREBETWEEN; AND HARDFACING MATERIAL ON THE LEADING FACES OF SAID CUTTER BLADES AND EXTENDING SUBSTANTIALLY ACROSS SAID SLOTS; THE SLOTS SEPARATING THE BLADE SEGMENTS OF ONE SET BEING LONGITUDINALLY OFFSET WITH RESPECT TO THE SLOTS SEPARATING THE BLADE SEGMENTS OF AN ADJACENT SET.
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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |