Method for maintaining fluidity of cement compositions
Abstract
Abstract THE FLUIDITY OF CEMENT COMPOSITIONS CAN BE MAINTAINED BY ADDING TO THE CEMENT COMPOSITION A NON-RETARDING, NONAIR-ENTRAINING CEMENT DISPERSING AGENT SELECTED FROM THE GROUP CONSISTING OF (A) WATER-SOLUBLE SALTS OF CONDENSATES HAVING MOLECULAR WEIGHTS OF NOT LESS THAN 1500, AND OBTAINED BY CONDENSING WITH FORMALDEHYDE SULFONATED PRODUCTS OF MONOCYCLIC OR FUSED POLYCYCLIC AROMATIC BENZENOID HYDROCARBON COMPOUNDS AND (B) WATER-SOLUBLE SALTS OF SULFONATED PRODUCTS OF FUSED POLYCYCLIC AROMATIC BENZENOID HYDROCARBON COMPOUNDS HAVING AT LEAST 3 BENZENE RINGS, THE DISPERSING AGENT BEING ADDED AT AT LEAST TWO CHRONOLOGICALLY SPACED INTERVALS OR CONTINUOUSLY SO THAT THE FLUIDITY OF THE CEMENT COMPOSITION CAN BE MAINTAINED OVER AN EXTENDED PERIOD OF TIME.
Inventors
- 👤 T Kitsuda
- 👤 C Yamakawa
- 👤 K Hattori
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |