Patent US2757738A successfully refreshed from Google Patents.
US2757738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation heating
Assignee: Union Oil Company of California
•
Filing: 1948-09-20
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Granted: 1956-08-07
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Expires: 1968-09-20
Abstract
No abstract record available.
Inventors
- 👤 Harold W Ritchey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:23
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/2401
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN THE METHOD OF RECOVERING PETROLEUM FROM A WELL PENETRATING AN UNDERGROUND OIL-BEARING FORMATION, THE STEPS COMPRISING GENERATING SHORT ELECTROMAGNETIC WAVES AND PASSING SAID WAVES HAVING SHARP BANDS OR FREQUENCIES WITHIN THE RANGE OF 1 TO 30 MEGACYCLES FROM A RADIATOR WITHIN THE WELL INTO THE SURROUNDING OIL-BEARING FORMATION, WHEREBY THE ABSORPTION OF SAID HIGH-FREQUENCY ELECTROMAGNETIC WAVES BY SAID OIL-BEARING FORMATION CREATES HEAT WITHIN SAID FORMATION, THEREBY INCREASING THE RATE OF FLOW OF LIQUID PETROLEUM THROUGH SAID FORMATION, COLLECTING PETROLEUM IN THE WELL AND THEREAFTER PUMPING IT TO THE SURFACE OF THE GROUND.
Claim 2
Dependent Claim
93 words
IN THE METHOD OF RECOVERING PETROLEUM FROM A WELL PENETRATING AN UNDERGROUND OIL-BEARING FORMATION, THE STEPS COMPRISING GENERATING SHORT ELECTROMAGNETIC WAVES AND PASSING SAID WAVES HAVING SHARP BANDS OR FREQUENCIES WITHIN THE RANGE OF 1 TO 30 MEGACYCLES FROM A RADIATOR WITHIN THE WELL INTO THE SURROUNDING OIL-BEARING FORMATION, WHEREBY THE ABSORPTION OF SAID HIGH-FREQUENCY ELECTROMAGNETIC WAVES BY SAID OIL-BEARING FORMATION CREATES HEAT WITHIN SAID FORMATION, THEREBY INCREASING THE RATE OF FLOW OF LIQUID PETROLEUM THROUGH SAID FORMATION, COLLECTING PETROLEUM IN THE WELL AND THEREAFTER PUMPING IT TO THE SURFACE OF THE GROUND.
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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) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |