US3746557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardening agent for refractory use and production thereof
Assignee: Taki Chemical Co Ltd
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Filing: 1971-07-29
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Granted: 1973-07-17
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Expires: 1991-07-29
Abstract
Abstract A NOVEL HARDENING AGENT FOR REFRACTORY USE IN COMBINATION WITH A PHOSPHATE-OR PHOSPHORIC ACID-TYPE BINDER IS PROVIDED WHICH COMPRISES ACTIVE ALUMINUM HYDROXIDEBORATE COMPLEX IN WHICH THE MOLAR RATIO. AL203/B2O3, LIES WITHIN THE RANGE OF ABOUT 1 TO 24. THE HARDENING AGENT IS PRODUCED BY A REACTION, IN THE PRESENCE OF A WATER OF AN ALUMINUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMINUM ALCOHOLTES AND ALUMINUM PHENOLATE WITH A BORIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF BORIC ACID, AMMONIUM BORATE, ALKALI BORATES AND BORIC ESTERS IN A PROPORTION AS TO BRING THE MOLAR RATIO, AL2O3/B2O3, WITHIN THE RANGE OF ABOUT 1 TO 24.
Inventors
- 👤 E Shimazaki
- 👤 S Araki
- 👤 H Akazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:56
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |