Patent US2587879A successfully refreshed from Google Patents.
US2587879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for liquefying paraffin in wells
Assignee: Individual
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Filing: 1949-02-04
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Granted: 1952-03-04
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Expires: 1969-02-04
Abstract
No abstract record available.
Inventors
- 👤 Paul H Nash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:14
CPC Classifications
E; E21; E21B; E21B36/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7737
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN A PARAFFIN EXTRACTOR FOR CASED WELLS, AN ELONGATED TUBULAR BODY INCORPORATED IN THE LENGTH OF THE TUBING STRING IN A WELL AND COMPOSED OF A MATERIAL HAVING A LOW COEFFICIENT OF EXPANSION, SAID BODY HAVING CIRCUMFERENTIALLY SPACED PORTS THEREIN ADJACENT ITS LOWER END, A TUBULAR EXPANSION ELEMENT SURROUNDING SAID BODY AND COMPOSED OF A METAL HAVING A HIGH COEFFICIENT OF EXPANSION, SAID TUBULAR EXPANSION ELEMENT BEING IN FIXED RELATIONSHIP WITH SAID TUBULAR BODY AT ITS UPPER END, A SLEEVE ATTACHED TO THE LOWER END OF SAID TUBULAR EXPANSION ELEMENT, SLIDABLE ON SAID TUBULAR BODY AND HAVING PORTS ALIGNABLE WITH THOSE OF SAID TUBULAR BODY AND MEANS FOR INTRODUCING STEAM INTO THE CASING OF SAID WELL, THE DIFFERENCE IN COEFFICIENT TO EXPANSION BETWEEN SAID TUBULAR EXPANSION ELEMENT AND SAID BODY BEING SUFFICIENT UNDER THE TEMPERATURE OF SAID STEAM TO CAUSE SAID EXPANSION ELEMENT TO EXPAND AND TO BRING INTO REGISTER THE PORTS OF SAID SLEEVE AND BODY FOR THE ADMISSION OF STEAM INTO SAID BODY AND TUBING STRING.
Claim 2
Dependent Claim
168 words
IN A PARAFFIN EXTRACTOR FOR CASED WELLS, AN ELONGATED TUBULAR BODY INCORPORATED IN THE LENGTH OF THE TUBING STRING IN A WELL AND COMPOSED OF A MATERIAL HAVING A LOW COEFFICIENT OF EXPANSION, SAID BODY HAVING CIRCUMFERENTIALLY SPACED PORTS THEREIN ADJACENT ITS LOWER END, A TUBULAR EXPANSION ELEMENT SURROUNDING SAID BODY AND COMPOSED OF A METAL HAVING A HIGH COEFFICIENT OF EXPANSION, SAID TUBULAR EXPANSION ELEMENT BEING IN FIXED RELATIONSHIP WITH SAID TUBULAR BODY AT ITS UPPER END, A SLEEVE ATTACHED TO THE LOWER END OF SAID TUBULAR EXPANSION ELEMENT, SLIDABLE ON SAID TUBULAR BODY AND HAVING PORTS ALIGNABLE WITH THOSE OF SAID TUBULAR BODY AND MEANS FOR INTRODUCING STEAM INTO THE CASING OF SAID WELL, THE DIFFERENCE IN COEFFICIENT TO EXPANSION BETWEEN SAID TUBULAR EXPANSION ELEMENT AND SAID BODY BEING SUFFICIENT UNDER THE TEMPERATURE OF SAID STEAM TO CAUSE SAID EXPANSION ELEMENT TO EXPAND AND TO BRING INTO REGISTER THE PORTS OF SAID SLEEVE AND BODY FOR THE ADMISSION OF STEAM INTO SAID BODY AND TUBING STRING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |