Patents by Inventor Sadao Sugita

Sadao Sugita 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).

  • Silver halide emulsion containing an arylphosphonium salt as antifoggant
    Patent number: 3951661
    Abstract: Substances of the structure ##EQU1## wherein Z is phosphorus, X.sup.-is Cl.sup.-, Br.sup.-, ClO.sub.2 .sup.- or BF.sub.4 .sup.-, and R.sub.1 - R.sub.4 are alkyl or aromatic groups are excellent inhibitors of fog formation when incorporated in photographic emulsions containing silver halides.
    Type: Grant
    Filed: May 24, 1974
    Date of Patent: April 20, 1976
    Assignees: Konishiroku Photo Industry Co., Sankyo Company Limited
    Inventors: Nobuo Soma, Isao Kawamoto, Tomio Nakajima, Sadao Sugita, Tsuneo Wada, Shizuo Saito, Hiroyuki Inokuma, Koichi Horigome, Yukio Morifuji