US3373805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam lifting of heavy crudes
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1965-10-14
•
Granted: 1968-03-19
•
Expires: 1985-10-14
Abstract
No abstract record available.
Inventors
- 👤 Thomas C Boberg
- 👤 Jr Roe Clyde Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:35
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B36/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US971612A
Cited
US1439560A
Cited
US1565574A
Cited
US2828821A
Cited
US3177940A
Cited
US3312281A
Cited
US3302713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |