US4174972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonfibrous castable refractory concrete having high deflection temperature and high compressive strength and process
Assignee: Individual
•
Filing: 1978-04-20
•
Granted: 1979-11-20
•
Expires: 1998-04-20
Abstract
Abstract A nonfibrous castable refractory concrete, having a deflection temperature under load above 1000° C. and a compressive strength higher than 1450 Newton/cm 2 , comprising grains bound by a hydraulic binder and having a content by weight of aluminum expressed as Al 2 O 3 of from 40 to 60%, a content by weight of calcium expressed as CaO of from 4 to 14%, a content by weight of silicon expressed as SiO 2 of from 20 to 60% and a content by weight of fluorine of from 0.1 to 10%, a part of said fluorine being present as alkali or alkaline earth metal fluoride. The invention also provides a process for making said concrete.
Inventors
- 👤 Michel L. Drouzy
- 👤 Michel M. Richard
- 👤 Francois P. Huet
- 👤 Henri M. Lacau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; C04B28/00; C04B28/02; C04B28/24; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A nonfibrous castable refractory concrete nonwettable by molten aluminum, having a deflection temperature under load above 1000° C. and a compressive strength higher than 1450 Newton/cm 2 comprising grains bound by a hydraulic binder and having a content by weight of aluminum expressed as Al 2 O 3 of from 40 to 60%, a content by weight of calcium expressed as CaO of from 4 to 14%, a content by weight of silicon expressed as SiO 2 of from 20 to 60%, a content by weight of sodium, expressed as Na 2 O less than 2%, and a fluorine-containing material, consisting of F 2 Ca in an amount between 1 and 2% by weight or consisting of a mixture 0.8-1.2% by weight of alkali or alkaline-earth metal fluosilicate and 0.2-0.8% by weight of F 2 Ca, said fluorine-containing material being distributed uniformly throughout the mass of said concrete in a solid form.
Claim 2
Dependent Claim
152 words
A nonfibrous castable refractory concrete nonwettable by molten aluminum, having a deflection temperature under load above 1000° C. and a compressive strength higher than 1450 Newton/cm 2 comprising grains bound by a hydraulic binder and having a content by weight of aluminum expressed as Al 2 O 3 of from 40 to 60%, a content by weight of calcium expressed as CaO of from 4 to 14%, a content by weight of silicon expressed as SiO 2 of from 20 to 60%, a content by weight of sodium, expressed as Na 2 O less than 2%, and a fluorine-containing material, consisting of F 2 Ca in an amount between 1 and 2% by weight or consisting of a mixture 0.8-1.2% by weight of alkali or alkaline-earth metal fluosilicate and 0.2-0.8% by weight of F 2 Ca, said fluorine-containing material being distributed uniformly throughout the mass of said concrete in a solid form.
References Cited (Backward Citations)
US3617319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |