Patents by Inventor Masayuki Kuramitu

Masayuki Kuramitu 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: 5518873
    Abstract: A silver halide light-sensitive emulsion and a silver halide light-sensitive material containing the same are disclosed, in which silver halide emulsion grains composed of an internal nucleus of silver bromide or silver iodobromide having a silver iodide content of not more than 1 mol % having provided thereon, in the order described, a first coating layer of silver iodobromide having a silver iodide content of from 2 to 20 mol % and a second coating layer of silver iodobromide or silver bromide a silver iodide content of which is lower than that of said first coat and is not more than 3 mol %, and are further composed of iodide phrases which are formed by halogen conversion with an iodide ion, by addition of silver iodide fine grains or by addition of a silver ion and an iodide ion at any stage during formation of 3 to 97% of the total amount of silver and after completion of the formation of the second coating layer.
    Type: Grant
    Filed: January 10, 1995
    Date of Patent: May 21, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Ryutaro Konishi, Hiroshi Tamaoki, Masayuki Kuramitu, Hideo Ikeda, Katsuro Nagaoka
  • Patent number: 5308748
    Abstract: A silver halide photographic light-sensitive material comprising a support having thereon at least one light emulsion layer containing (A) at least one of the methine compounds represented by the following formula (I) and (B) at least one of the methine compounds represented by the following formula (II) or (III): ##STR1## wherein Z.sup.1, Z.sup.2, R.sup.1, R.sup.2, L.sub.1 -L.sub.8, p, q, k.sub.1 -k.sub.3, n.sub.1 -n.sub.3 and X.sub.1 -X .sub.3 are as defined in the specification.
    Type: Grant
    Filed: March 23, 1993
    Date of Patent: May 3, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akihiko Ikegawa, Masayuki Kuramitu, Masaki Okazaki