US3237692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of low-grade steam containing dissolved salts in an oil production method
Assignee: Shell USA Inc
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Filing: 1965-05-12
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Granted: 1966-03-01
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Expires: 1985-05-12
Abstract
No abstract record available.
Inventors
- 👤 Eugene W Wallace
- 👤 John A Pryor
- 👤 Bryant W Bradley
- 👤 George H Holliday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:59
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24
Claims Analysis
Total Claims: 0
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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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |