Patents by Inventor Keiko Nakousai

Keiko Nakousai 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: 4661158
    Abstract: A recording liquid mainly comprises a recording agent as an image-forming component and a liquid medium containing at least water and a glycol for dissolving or dispersing the recording agent, characterized in that the recording agent contains at least one of dyes represented by the following general formula (A): ##STR1## wherein M represents one element selected from H, Na, Li and K, and 55 mole % or more of total M given in the general formula (A) is Na, Li or K. The recording liquid may additionally contain a water-soluble organic solvent.
    Type: Grant
    Filed: May 10, 1985
    Date of Patent: April 28, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masatsune Kobayashi, Tsuyoshi Eida, Shoji Koike, Keiko Nakousai
  • Patent number: 4627875
    Abstract: A recording liquid comprises C.I.Acid Red 8 as a recording agent for forming an image and a liquid medium comprising at least(a) a member selected from the group consisting of polyethylene glycol, polyethylene glycol mono methylether and a mixture thereof,(b) a member selected from the group consisting of diethylene glycol, sulfolane and a mixture thereof,(c) a member selected from the group consisting of N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone and a mixture thereof, and(d) water.
    Type: Grant
    Filed: February 10, 1986
    Date of Patent: December 9, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masatsune Kobayashi, Tsuyoshi Eida, Shoji Koike, Keiko Nakousai
  • Patent number: 4585484
    Abstract: A recording liquid comprises a dye selected from C.I. Direct Blue 199, C.I. Direct Yellow 86 and C.I. Food Black 2 as the recording agent for forming an image and a liquid medium for dissolving or dispersing said recording agent therein, said liquid medium comprising at least: (a) either one or both of polyethylene glycol and polyethylene glycol monomethyl ether, (b) either one or both of diethylene glycol and sulfolane, (c) either one or both of N-methyl-2-pyrrolidone and 1,3-dimethyl-2-imidazolidinone and (d) water.
    Type: Grant
    Filed: March 20, 1984
    Date of Patent: April 29, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masahiro Haruta, Tadayuki Nakousai, Kazuo Iwata, Keiko Nakousai