Patent US3366176A successfully refreshed from Google Patents.
US3366176A
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Recovery of high viscosity oils by conduction heating
Assignee: Pan American Petroleum Corp
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Filing: 1966-04-28
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Granted: 1968-01-30
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Expires: 1986-04-28
Abstract
No abstract record available.
Inventors
- 👤 David R Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:02
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/2405; E21B33/00; E21B33/10; E21B33/13; E21B33/138; E21B43/25; E21B43/26; E21B43/267
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2946382A
Cited
US2962095A
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US3131761A
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US3180414A
Cited
US3221813A
Cited
US3297088A
Cited
US3342263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |