Patents by Inventor Michel M. Richard

Michel M. Richard has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Nonfibrous castable refractory concrete having high deflection temperature and high compressive strength and process
    Patent number: 4174972
    Abstract: A nonfibrous castable refractory concrete, having a deflection temperature under load above 1000.degree. C. and a compressive strength higher than 1450 Newton/cm.sup.2, comprising grains bound by a hydraulic binder and having a content by weight of aluminum expressed as Al.sub.2 O.sub.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.sub.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.
    Type: Grant
    Filed: April 20, 1978
    Date of Patent: November 20, 1979
    Inventors: Michel L. Drouzy, Michel M. Richard, Francois P. Huet, Henri M. Lacau