US2704980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well-producing apparatus
Assignee: Stanolind Oil and Gas Co
•
Filing: 1950-11-22
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Granted: 1955-03-29
•
Expires: 1970-11-22
Abstract
No abstract record available.
Inventors
- 👤 Renic P Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:51
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
AN APPARATUS FOR RAISING FLUIDS THROUGH A VERTICAL TUBING COMPRISING A CLOSED VARIABLE VOLUME CHAMBER, A LIQUID IN SAID CHAMBER, A PISTON IN SAID CHAMBER FORMING A MOVABLE WALL THEREIN, SAID LIQUID HAVING A TEMPERATURE COEFFICIENT OF CUBICAL EXPANSION SUBSTANTIALLY DIFFERENT FROM THE TEMPERATURE COEFFICIENT OF CUBICAL EXPANSION OF SAID CHAMBER, WHEREBY SAID PISTON IS MOVED IN SAID CHAMBER BY A CHANGE IN VOLUME OF SAID LIQUID DUE TO A TEMPERATURE CHANGE OF SAID LIQUID, AND AN EXPANDABLE PACKER OPERATIVELY CONNECTED AT ONE END WITH SAID CHAMBER AND AT THE OTHER END WITH SAID PISTON, WHEREBY THE MOVEMENT OF SAID PISTON IS ADAPTED TO VARY THE DIAMETER OF SAID PACKER.
Claim 2
Independent Claim
110 words
AN APPARATUS FOR RAISING FLUIDS THROUGH A VERTICAL TUBING COMPRISING A CLOSED VARIABLE VOLUME CHAMBER, A LIQUID IN SAID CHAMBER, A PISTON IN SAID CHAMBER FORMING A MOVABLE WALL THEREIN, SAID LIQUID HAVING A TEMPERATURE COEFFICIENT OF CUBICAL EXPANSION SUBSTANTIALLY DIFFERENT FROM THE TEMPERATURE COEFFICIENT OF CUBICAL EXPANSION OF SAID CHAMBER, WHEREBY SAID PISTON IS MOVED IN SAID CHAMBER BY A CHANGE IN VOLUME OF SAID LIQUID DUE TO A TEMPERATURE CHANGE OF SAID LIQUID, AND AN EXPANDABLE PACKER OPERATIVELY CONNECTED AT ONE END WITH SAID CHAMBER AND AT THE OTHER END WITH SAID PISTON, WHEREBY THE MOVEMENT OF SAID PISTON IS ADAPTED TO VARY THE DIAMETER OF SAID PACKER.
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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) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |