US3767435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid hardening portland cement clinker composition
Assignee: Taiheiyo Cement Corp
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Filing: 1971-12-15
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Granted: 1973-10-23
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Expires: 1991-12-15
Abstract
Abstract A rapid hardening portland cement comprising 40 - 60 percent by weight of 11CaO.7A12O3.CaF2 phase and 30 - 50 percent by weight of 3CaO.SiO2 solid solution phase as the main mineral composition thereof and a process for manufacturing it.
Inventors
- 👤 S Mori
- 👤 H Uchikawa
- 👤 S Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:18
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/32; C04B7/326
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
A rapid hardening cement clinker claimed in claim 1, in which lower than 3 percent by weight of Fe2O3 are comprised in addition to said mineral compositions.
Claim 2
Dependent Claim
74 words
A process for manufacturing a rapid hardening cement clinker which consists essentially of mixing mainly an aluminous material, a calcareous material, a silicious material and a fluoride so as to make 20 - 33 percent by weight of Al2O3, 7.2 -15.5 percent by weight of SiO2, 52 - 62 percent by weight of CaO and 1.3 - 2.6 percent by weight of F, and burning the mixture at the temperature of 1260* - 1360*C.
Claim 3
Dependent Claim
23 words
A process claimed in claim 3, in which less than 3 percent by weight of Fe2O3 in addition to said mixture present therein.
References Cited (Backward Citations)
US3628973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |