Patent US2368963A successfully refreshed from Google Patents.
US4523640A
Expired / Lapsed
US
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Arm release system for well logging apparatus
Assignee: Western Atlas International Inc
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Filing: 1984-01-23
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Granted: 1985-06-18
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Expires: 2004-01-23
Abstract
Abstract A well logging instrument includes a body member supporting one or more arm members which may be biased outwardly against the sidewalls of the borehole. The arm members may be held in a closed position, adjacent the body member, during entry into a borehole by a heat sensitive retaining member. As the instrument is exposed to borehole temperature the heat sensitive retaining member will within a preselected temperature range release the arm member allowing the arm members to expand outwardly from the body member into contact with the sides of the borehole.
Inventors
- 👤 Herbert C. Wilson
- 👤 Perumalagaram S. Sankaran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:56
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B36/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
56 words
A well logging apparatus, comprising: an elongated body member adopted to traverse a borehole; at least one arm member pivotally attached to said body member; means for biasing said arm member outwardly with respect to said body member; and temperature responsive means for restraining said arm member in a closed position during entry into said borehole.
Claim 2
Dependent Claim
56 words
A well logging apparatus, comprising: an elongated body member adopted to traverse a borehole; at least one arm member pivotally attached to said body member; means for biasing said arm member outwardly with respect to said body member; and temperature responsive means for restraining said arm member in a closed position during entry into said borehole.
Claim 3
Dependent Claim
27 words
The well logging apparatus of claim 1 wherein said temperature responsive means comprises means for releasing said arm member for outward exansion at an approximate predetermined temperature.
Claim 4
Dependent Claim
20 words
The well logging apparatus of claim 2 wherein said temperature responsive restraining means comprises at least one eutectic alloy member.
Claim 5
Dependent Claim
17 words
The well logging apparatus of claim 3 wherein said eutectic alloy member comprises a bismuth alloy member.
Claim 6
Dependent Claim
16 words
The well logging apparatus of claim 4 wherein said bismuth alloy member comprises bismuth and lead.
Claim 7
Dependent Claim
20 words
The well logging apparatus of claim 5 wherein said bismuth alloy member comprises 55.5 percent bismuth and 44.5 percent lead.
Claim 8
Dependent Claim
16 words
The well logging apparatus of claim 4 wherein said bismuth alloy member comprises bismuth and tin.
Claim 9
Dependent Claim
20 words
The well logging apparatus of claim 7 wherein said bismuth alloy member comprises 58 percent bismuth and 42 percent tin.
Claim 10
Dependent Claim
84 words
A well logging apparatus, comprising: an elongated body member adapted to traverse a borehole; an arm carrier member slidably mounted on said body member for longitudinal movement thereon; a plurality of arm members mounted to said arm carrier member; biasing means for reseliently biasing said arm carrier to move said arm members outwardly with respect to said body member; and means for restraining said arm members in a closed position and releasing said arm members to an outwardly expanded position in response to temperature.
Claim 11
Dependent Claim
84 words
A well logging apparatus, comprising: an elongated body member adapted to traverse a borehole; an arm carrier member slidably mounted on said body member for longitudinal movement thereon; a plurality of arm members mounted to said arm carrier member; biasing means for reseliently biasing said arm carrier to move said arm members outwardly with respect to said body member; and means for restraining said arm members in a closed position and releasing said arm members to an outwardly expanded position in response to temperature.
Claim 12
Dependent Claim
34 words
The well logging apparatus of claim 9 wherein said restraining means comprises at least one threaded member threadably engaged in and extending through said first arm carrier member and engagable with said body member.
Claim 13
Dependent Claim
16 words
The well logging apparatus of claim 10 wherein said threaded member comprises an eutectic alloy member.
Claim 14
Dependent Claim
17 words
The well logging apparatus of claim 11 wherein said eutectic alloy member comprises a bismuth alloy member.
Claim 15
Dependent Claim
16 words
The well logging apparatus of claim 12 wherein said bismuth alloy member comprises bismuth and lead.
Claim 16
Dependent Claim
20 words
The well logging apparatus of claim 13 wherein said bismuth alloy member comprises 55.5 percent bismuth and 44.5 percent lead.
Claim 17
Dependent Claim
16 words
The well logging apparatus of claim 12 wherein said bismuth alloy member comprises bismuth and tin.
Claim 18
Dependent Claim
20 words
The well logging apparatus of claim 15 wherein said bismuth alloy member comprises 58 percent bismuth and 42 percent tin.
Claim 19
Dependent Claim
19 words
The well logging apparatus of claim 9 further comprising means for heating said restraining means to a predetermined temperature.
References Cited (Backward Citations)
US2170527A
Cited
US2680913A
Cited
US2719361A
Cited
US2931440A
Cited
US2829441A
Cited
US4425966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |