US3386508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and system for the recovery of viscous oil
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1966-02-21
•
Granted: 1968-06-04
•
Expires: 1986-02-21
Abstract
No abstract record available.
Inventors
- 👤 Walter J Bielstein
- 👤 Lawrence G Rawl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:01
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/30; E21B43/305; E21B43/16; E21B43/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2788956A
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US2946382A
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US2906337A
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US3024013A
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US2970826A
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US3212579A
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US3233670A
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US3241611A
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US3233668A
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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) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |