Patents by Inventor Kosaburo Matsumura

Kosaburo Matsumura 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).

  • Planarizing material and planarizing method
    Patent number: 5677380
    Abstract: A planarizing material comprising a resin capable of having its practical temperature for a planarizing step set at a level lower than 200.degree. C., and a melamine-type heat-curing agent and/or an epoxy-type heat-curing agent.
    Type: Grant
    Filed: March 24, 1995
    Date of Patent: October 14, 1997
    Assignee: Tosoh Corporation
    Inventors: Kosaburo Matsumura, Mitsumasa Akashi, Yoshitaka Tsutsumi, Masazumi Hasegawa
  • Photoresist composition comprising a non-aromatic resin having no aromatic structures derived from units of an aliphatic cyclic hydrocarbon and units of maleic anhydride and/or maleimide and a photosensitive agent
    Patent number: 5212043
    Abstract: A photoresist composition comprising:a resin soluble in an aqueous alkaline solution, having units of an aliphatic cyclic hydrocarbon main frame and units derived from maleic anhydride and/or units derived from a maleimide; anda photosensitive agent in a sufficient amount to promote or hinder the solubility of said resin in an aqueous alkaline solution upon exposure to active radiation so as to create a substantial difference in the solubility as between an exposed portion and a non-exposed portion and to form a positive or negative image by subsequent development with an aqueous alkaline solution.
    Type: Grant
    Filed: October 17, 1990
    Date of Patent: May 18, 1993
    Assignee: Tosho Corporation
    Inventors: Takashi Yamamoto, Masaaki Todoko, Toru Seita, Kyoko Nagaoka, Kosaburo Matsumura