Patent US2978409A successfully refreshed from Google Patents.
US2978409A
Expired / Lapsed
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Composition and method for the elimination of water-block in oil wells
Assignee: Rohm and Haas Co
•
Filing: 1957-07-09
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Granted: 1961-04-04
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Expires: 1977-07-09
Abstract
No abstract record available.
Inventors
- 👤 Harold L Greenwald
- 👤 Jr Ralph L Givens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:21
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/32; Y; Y10; Y10S; Y10S507/00; Y10S507/935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A COMPOSITION CONSISTING ESSENTIALLY OF AN OLEAGINOUS CARRIER HAVING INCORPORATED THEREIN COMPOUNDS HAVING THE FORMULAS
Claim 2
Dependent Claim
15 words
A COMPOSITION CONSISTING ESSENTIALLY OF AN OLEAGINOUS CARRIER HAVING INCORPORATED THEREIN COMPOUNDS HAVING THE FORMULAS
References Cited (Backward Citations)
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US2800962A
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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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |