Patent US2672201A successfully refreshed from Google Patents.
US2672201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing production of oil wells
Assignee: Pure Oil Co
•
Filing: 1950-08-19
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Granted: 1954-03-16
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Expires: 1970-08-19
Abstract
No abstract record available.
Inventors
- 👤 Roy H Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:25
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/845; Y; Y10; Y10S; Y10S507/00; Y10S507/902; Y10S507/935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
THE METHOD OF INCREASING THE PERMEABILITY OF SILICEOUS EARTH FORMATIONS FOR THE PURPOSE OF
Claim 2
Independent Claim
14 words
THE METHOD OF INCREASING THE PERMEABILITY OF SILICEOUS EARTH FORMATIONS FOR THE PURPOSE OF
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) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |