Patent US3599734A successfully refreshed from Google Patents.
US3599734A
Expired / Lapsed
US
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Notching tool
Assignee: C0NSOLIDATION COAL Co
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Filing: 1969-08-06
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Granted: 1971-08-17
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Expires: 1989-08-06
Abstract
Abstract An apparatus for forming a biconical notch by moving a symmetrical extendable cutter out of a rotating drill casing into the formation. Once the biconical notch is completed, the extending device can be retracted back into the drill casing and the casing removed.
Inventors
- 👤 Nathandale Farris
- 👤 Tibor O Edmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:53
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/112
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A notching tool for the wall of a bore hole compRising: a. a tubular housing having an elongated longitudinal slot therethrough; b. first and second spaced extender means; c. a threaded rod means one-half of which is threaded in the opposite direction from the remaining half, each set of threads having screwed thereon one of said spaced extender means, d. means connected to one end of said threaded rod for turning said rod about its axis; e. first and second symmetrically formed notching members pivotally attached at one end to each other and at the other end to said first and second spaced extender means to uniformly urge said first and second symmetrically formed notching members out of said slot; and f. notching means attaching at one end to the pivotal end of said first notching member, the remaining end having a sharp periphery with a cutting angle of approximately 30*.
Claim 2
Dependent Claim
151 words
A notching tool for the wall of a bore hole compRising: a. a tubular housing having an elongated longitudinal slot therethrough; b. first and second spaced extender means; c. a threaded rod means one-half of which is threaded in the opposite direction from the remaining half, each set of threads having screwed thereon one of said spaced extender means, d. means connected to one end of said threaded rod for turning said rod about its axis; e. first and second symmetrically formed notching members pivotally attached at one end to each other and at the other end to said first and second spaced extender means to uniformly urge said first and second symmetrically formed notching members out of said slot; and f. notching means attaching at one end to the pivotal end of said first notching member, the remaining end having a sharp periphery with a cutting angle of approximately 30*.
Claim 3
Dependent Claim
15 words
A device as described in claim 1 wherein said rotating means comprises an electrical motor.
Claim 4
Dependent Claim
45 words
A device as described in claim 1 wherein said rotating means comprises an elongated rod coupled to said threaded rod at one end and to handle at the other end, the length of said elongated rod being sufficient to extend out of said bore hole.
References Cited (Backward Citations)
US84852A
Cited
US821816A
Cited
US1561523A
Cited
US1614368A
Cited
US1822216A
Cited
GB331945A
Cited
US2372875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |