Patents by Inventor Shirow Askawa

Shirow Askawa 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).

  • Dry working photographic process relating to N-vinyl compound system
    Patent number: 3953210
    Abstract: A film coated with a dispersion of an N-vinyl compound, an organic halogen compound and a sensitizer in gelatin is preheated at 60.degree.-120.degree.C before an imagewise exposure to sensitize the film and to destroy fog-nuclei. After the imagewise exposure the film is subjected to a red light flood exposure for intensifying latent image, heating for development and flood light exposure for fixing to give a negative image of high contrast. The preheating may be applied to a film once exposed to extinguish the resulting latent image and thereby to be subjected to another exposure.
    Type: Grant
    Filed: July 23, 1974
    Date of Patent: April 27, 1976
    Assignee: Matsushita Electric Industrial Company Limited
    Inventors: Katsue Hasegawa, Reiji Sano, Shirow Askawa, Shunsuke Matsuda