US3361204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for treating an underground formation
Assignee: Pan American Petroleum Corp
•
Filing: 1965-06-25
•
Granted: 1968-01-02
•
Expires: 1985-06-25
Abstract
No abstract record available.
Inventors
- 👤 George C Howard
- 👤 William G Bearden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:59
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/119
Claims Analysis
Total Claims: 0
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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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |