Patents by Inventor Sakae Nagasawa

Sakae Nagasawa 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).

  • Investment casting process of chromium-cobalt and/or nickel alloys
    Patent number: 4060120
    Abstract: An improved investment casting process for producing dental restorations, particularly a dental crown, comprising the steps of fixing a wax pattern onto a truncated cone in a metallic ring having a lining of a cushioning material, pouring an investment material into the space around the wax pattern in the metallic ring, drying the resultant product, melting out the invested wax pattern, curing the resultant product at a temperature of 700.degree. to 950.degree. C for 20 to 150 minutes to give a mold, fixing the mold thus obtained to a centrifugal casting machine and casting a molten chromium-cobalt and/or nickel alloy in the mold maintained at a temperature of 100.degree. to 500.degree. C.
    Type: Grant
    Filed: December 31, 1975
    Date of Patent: November 29, 1977
    Assignees: Matsumoto Dental College, Sumitomo Chemical Company, Limited
    Inventors: Shigeo Takahashi, Michio Ito, Sakae Nagasawa, Sigeo Suzuki