Patents by Inventor Yoshikatu Sawada

Yoshikatu Sawada 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).

  • Water based photosensitive composition with hydrolyzate of mammal collagen
    Patent number: 4433043
    Abstract: A water based photosensitive composition comprises a hydrolyzate of a mammal collagen and a photosensitizer serving to cross-link the hydrolyzate when exposed to an active light. The hydrolyzate has a number-average molecular weight, Mn, of 2,000 to 30,000 and an intrinsic viscosity, [.eta.], of 0.060 to 0.155 dl/g in a 0.15 mole citric acid buffer solution maintained at 40.degree.C. Also, the hydrolyzate is capable of maintaining the formability of the collagen fold. A photoresist pattern formed by using the composition exhibits a high resolution, a good dyeing property and a strong corrosion resistance.
    Type: Grant
    Filed: November 13, 1981
    Date of Patent: February 21, 1984
    Assignees: Toppan Printing Co., Ltd., Nippi, Inc.
    Inventors: Yoshikatu Sawada, Kazuo Shirakawa, Takeo Sugiura