Patents by Inventor Ryuji Nakayama

Ryuji Nakayama 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).

  • Electrophotographic photoreceptor containing polycarbonate resin as a binder and method for preparation thereof
    Patent number: 5292607
    Abstract: A novel electrophotographic photoreceptor and a method of preparation therof are disclosed. The photoreceptor is characterized in that the photosensitive layer contain a specific carbonate resin binder resin having a weight average molecular weight on not less than 200,000. The resin is preferably a polycarbonate resin which contains repeating units represented by the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are respectively and independently a hydrogen atom, a lower alkyl group, a halogen atom or an unsubstituted or substituted aromatic group; and R.sup.9 and R.sup.10 are respectively and independently a hydrogen atom, a lower alkyl group, an unsubstituted or substituted aromatic group, or form a ring or a carbonyl group together with the linking carbon atom.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: March 8, 1994
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Ryoko Aso, Michio Kawai, Osamu Murakami, Mamoru Nozomi, Ryuji Nakayama, Tadashi Umehara