Patents by Inventor Tsuyoshi Fukuhara

Tsuyoshi Fukuhara 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).

  • Catalytic preparation of aromatic polyketone from phosgene and aromatic ether or sulfide
    Patent number: 4707536
    Abstract: Disclosed herein is a process for producing aromatic polyketone, comprising reacting a compound represented by the formula (I): ##STR1## wherein each of R.sup.1 to R.sup.12 represents a hydrogen atom, a halogen atom, a hydrocarbon group or an alkoxy group; X.sup.1 and X.sup.2 respectively represent an oxygen atom or a sulfur atom and n is an integer of from 0 to 5,with phosgene (i) in the presence of a fluoroalkanesulfonic acid or (ii) in hydrogen fluoride in the presence of boron trifluoride at a temperature of from 65.degree. to 90.degree. C.
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: November 17, 1987
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Norihiko Yoneda, Tsuyoshi Fukuhara, Seiichi Nozawa