US3261934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure balanced hydraulic timedelay borehole switch
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1963-12-04
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Granted: 1966-07-19
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Expires: 1983-12-04
Abstract
No abstract record available.
Inventors
- 👤 Iii James W Kisling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:09
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/01; H; H01; H01H; H01H35/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A DOWNHOLE SWITCHING ASSEMBLY FOR BOREHOLE INSTRUMENTS COMPRISING: A HOUSING ADAPTED FOR DEPENDENT COUPLING TO A BOREHOLE INSTRUMENT, SAID HOUSING HAVING A CHAMBER RECEIVING A FLUID, MEANS FOR DISPLACING SAID FLUID FROM SAID CHAMBER INCLUDING A PISTON MEMBER SLIDABLY MOUNTED IN SAID CHAMBER FOR TRAVEL THEREIN BETWEEN SPACED POSITIONS RELATIVE TO SAID HOUSING; MEANS EXTERNAL OF SAID HOUSING AND ENGAGEABLE WITH AN OBSTRUCTION IN A BOREHOLE FOR MOVING SAID PISTON MEMBER FROM ONE OF SAID POSITIONS TO THE OTHER TO SAID POSITIONS TO DISPLACE SAID FLUID; FLOW-RESTRICTION MEANS REGULATING THE DISPLACEMENT OF SAID OF SAID CHAMBER FOR RETARDING THE TRAVEL OF SAID PISTON MEMBER; SELECTIVELY-OPERABLE ELECTRICAL SWITCH MEANS ON SAID HOUSING; MEANS RESPONSIVE TO TRAVEL OF SAID PISTON MEMBER FOR OPERATING SAID SWITCH MEANS; AND MEANS TRANSMITTING PRESSURE EXTERNAL OF SAID HOUSING INTO SAID CHAMBER FOR PRESSURE-BALANCING SAID PISTON MEMBER.
Claim 2
Dependent Claim
140 words
A DOWNHOLE SWITCHING ASSEMBLY FOR BOREHOLE INSTRUMENTS COMPRISING: A HOUSING ADAPTED FOR DEPENDENT COUPLING TO A BOREHOLE INSTRUMENT, SAID HOUSING HAVING A CHAMBER RECEIVING A FLUID, MEANS FOR DISPLACING SAID FLUID FROM SAID CHAMBER INCLUDING A PISTON MEMBER SLIDABLY MOUNTED IN SAID CHAMBER FOR TRAVEL THEREIN BETWEEN SPACED POSITIONS RELATIVE TO SAID HOUSING; MEANS EXTERNAL OF SAID HOUSING AND ENGAGEABLE WITH AN OBSTRUCTION IN A BOREHOLE FOR MOVING SAID PISTON MEMBER FROM ONE OF SAID POSITIONS TO THE OTHER TO SAID POSITIONS TO DISPLACE SAID FLUID; FLOW-RESTRICTION MEANS REGULATING THE DISPLACEMENT OF SAID OF SAID CHAMBER FOR RETARDING THE TRAVEL OF SAID PISTON MEMBER; SELECTIVELY-OPERABLE ELECTRICAL SWITCH MEANS ON SAID HOUSING; MEANS RESPONSIVE TO TRAVEL OF SAID PISTON MEMBER FOR OPERATING SAID SWITCH MEANS; AND MEANS TRANSMITTING PRESSURE EXTERNAL OF SAID HOUSING INTO SAID CHAMBER FOR PRESSURE-BALANCING SAID PISTON MEMBER.
References Cited (Backward Citations)
US969940A
Cited
US2320863A
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US2584028A
Cited
US2637788A
Cited
US2854758A
Cited
US2953659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |