Patents by Inventor Yoo Iijima

Yoo Iijima 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).

  • Patent number: 4113489
    Abstract: High-contrast photographic images are obtained by developing with a developer containing at least one dihydroxybenzene and sulfite ion and then treating with a solution of an oxidizing agent.
    Type: Grant
    Filed: March 1, 1972
    Date of Patent: September 12, 1978
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Mitsunori Sugiyama, Shoji Ishiguro, Nobuo Sugiyama, Yoo Iijima, Eiichi Okutsu, Haruhiko Iwano, Katsumi Hosoya, Hikoharu Hara
  • Patent number: 4108662
    Abstract: A process for developing a photographic light-sensitive material for the graphic arts which comprises infectiously developing a silver halide light-sensitive material comprising a support having coated thereon a silver halide emulsion layer containing at least 60 mol% silver chloride with an infectious developing solution containing a compound represented by the general formula (I): ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having up to 12 carbon atoms, or a halogen atom; and n is 1 to 2.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: August 22, 1978
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Katsumi Hayashi, Yoo Iijima, Eiichi Okutsu
  • Patent number: 4022621
    Abstract: A photographic developer composition containing (1) a developing agent, (2) a carbonyl-bisulfite, (3) a carbonate and (4) a primary or secondary alkanolamine, the alkanolamine being present in a molar amount less than the amount of said carbonylbisulfite.
    Type: Grant
    Filed: September 12, 1975
    Date of Patent: May 10, 1977
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Katsumi Hayashi, Yoo Iijima
  • Patent number: 3984243
    Abstract: A photographic developer composition for obtaining high contrast images which comprises (1) a dihydroxybenzene developing agent, (2) an alkanolamine and (3) a compound having the following formula (I) ##SPC1##wherein R.sub.1 and R.sub.2 each represents a lower aliphatic hydrocarbon group, wherein R.sub.1 and R.sub.2 may combine to form a ring, n represents 0 or 1, and X.sup..crclbar. represents an anion.
    Type: Grant
    Filed: December 21, 1973
    Date of Patent: October 5, 1976
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Isao Shimamura, Yoo Iijima, Katsumi Hayashi, Haruhiko Iwano, Tadao Shishido