US2865876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-water-loss cement composition and method of forming a slurry of the same
Assignee: Pan American Petroleum Corp
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Filing: 1953-11-30
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Granted: 1958-12-23
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Expires: 1973-11-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Platho P Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:55
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/20; C04B24/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A LOW-WATER-LOSS CEMENT COMPOSITION COMPRISING HYDRAULIC CEMENT AND FROM ABOUT 0.5 TO ABOUT 5.0 PERCENT, BASED ON THE DRY CEMENT, OF A SALT OF SULFONATED POLYSTYRENE, SAID POLYSTYRENE BEFORE SULFONATION HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 10,000 AND ABOUT 400,000, SAID SULFONATED POLYSTYRENE CONTAINING BETWEEN ABOUT 0.7 AND ABOUT 2.0 SULFONIC ACID GROUPS PER STYRENE UNIT AND SAID SALT BEING SELECTED FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL SALTS.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |