Patent US3303402A successfully refreshed from Google Patents.
Patent US2718145A successfully refreshed from Google Patents.
US2718145A
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Surface indicating bottom-hole pressure measuring device
Assignee: Phillips Petroleum Co
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Filing: 1949-09-16
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Granted: 1955-09-20
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Expires: 1969-09-16
Abstract
No abstract record available.
Inventors
- 👤 Robert G Nisle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:13
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; G; G01; G01L; G01L9/00; G01L9/0033; G01L9/0035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
PRESSURE INDICATING APPARATUS FOR PRODUCING AN IMPEDANCE REPRESENTATIVE OF THE PRESSURE IN A WELL HAVING TUBING THEREIN WHICH COMPRISES, IN COMBINATION, A HOUSING SECURED TO THE LOWER END OF SAID TUBING, A BELLOWS CARRIED BY SAID HOUSING, A MOVABLE MEMBER SECURED TO SAID BELLOWS, A SPRING FOR URGING SAID BELLOWS TO AN EXTENDED POSITION, THE WELL PRESSURE URGING SAID BELLOWS TO TO COLLAPSED POSITION, A PLURALITY OF PIVOTED RODS ARRANGED TO FORM A PARALLELOGRAM, TWO OPPOSITE CORNERS OF SAID PARALLELOGRAM BEING CONNECTED, RESPECTIVELY, TO SAID HOUSING AND THE MOVABLE MEMBER SECURED TO SAID BELLOWS, AND A COIL OF RESISTANCE WIRE CONNECTED BETWEEN THE OTHER OPPOSITE CORNERS OF SAID AARALLELGRAM, THE RESISTANCE OF SAID WIRE VARYING IN ACCORDANCE WITH THE POSITION OF SAID BELLOWS.
Claim 2
Dependent Claim
123 words
PRESSURE INDICATING APPARATUS FOR PRODUCING AN IMPEDANCE REPRESENTATIVE OF THE PRESSURE IN A WELL HAVING TUBING THEREIN WHICH COMPRISES, IN COMBINATION, A HOUSING SECURED TO THE LOWER END OF SAID TUBING, A BELLOWS CARRIED BY SAID HOUSING, A MOVABLE MEMBER SECURED TO SAID BELLOWS, A SPRING FOR URGING SAID BELLOWS TO AN EXTENDED POSITION, THE WELL PRESSURE URGING SAID BELLOWS TO TO COLLAPSED POSITION, A PLURALITY OF PIVOTED RODS ARRANGED TO FORM A PARALLELOGRAM, TWO OPPOSITE CORNERS OF SAID PARALLELOGRAM BEING CONNECTED, RESPECTIVELY, TO SAID HOUSING AND THE MOVABLE MEMBER SECURED TO SAID BELLOWS, AND A COIL OF RESISTANCE WIRE CONNECTED BETWEEN THE OTHER OPPOSITE CORNERS OF SAID AARALLELGRAM, THE RESISTANCE OF SAID WIRE VARYING IN ACCORDANCE WITH THE POSITION OF SAID BELLOWS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-19 | 1959-03-21 | 1959-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-19 | 1963-03-21 | 1963-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-19 | 1967-03-21 | 1967-09-20 | $7700.00 | Window Closed / Lapsed |