US3180748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-temperature well cement
Assignee: Pan American Petroleum Corp
•
Filing: 1961-11-02
•
Granted: 1965-04-27
•
Expires: 1981-11-02
Abstract
No abstract record available.
Inventors
- 👤 Carl R Holmgren
- 👤 William G Bearden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:00
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PUMPABLE, HIGH-TEMPERATURE COMPOSITION CONSISTING ESSENTIALLY OF: AN AQUEOUS IXTURE OF A HIGH-ALUMINA CEMENT AND SILICA FLOUR, SAID ALUMINA CEMENT AND SILICA FLOUR BEING IN A WEIGHT RATIO RANGING FROM ABOUT 1:1/4 TO ABOUT 1:3, AND A SET RETARDER SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL PHOSPHATES AND CALCIUM LIGNIN SULFONATE, SAID RETARDER BEING PRESENT IN A CONCENTRATION OF FROM 0.1 TO ABOUT 1 PERCENT BASED ON THE WEIGHT OF THE SOLIDS PRESENT.
Claim 2
Dependent Claim
77 words
A PUMPABLE, HIGH-TEMPERATURE COMPOSITION CONSISTING ESSENTIALLY OF: AN AQUEOUS IXTURE OF A HIGH-ALUMINA CEMENT AND SILICA FLOUR, SAID ALUMINA CEMENT AND SILICA FLOUR BEING IN A WEIGHT RATIO RANGING FROM ABOUT 1:1/4 TO ABOUT 1:3, AND A SET RETARDER SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL PHOSPHATES AND CALCIUM LIGNIN SULFONATE, SAID RETARDER BEING PRESENT IN A CONCENTRATION OF FROM 0.1 TO ABOUT 1 PERCENT BASED ON THE WEIGHT OF THE SOLIDS PRESENT.
References Cited (Backward Citations)
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US2845360A
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US3010835A
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Cited
US3100526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |