Patents by Inventor Haruo Masuda

Haruo Masuda 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: 5236738
    Abstract: A magnetic layer is overlaid on the front surface of a substrate, and a backing layer is overlaid on the back surface of the substrate. The backing layer is formed by the application of a coating composition, which contains inorganic grains and a binder, to the back surface of the substrate. The coating composition is prepared from the steps of kneading a mixture of the inorganic grains and the binder, in which the weight ratio of the inorganic grains to the binder falls within the range of 100:10 to 100:30, in a two-shaft continuous kneading and mixing machine. A dilution kneading process is then carried out on a mixture of the kneaded mixture, which results from the kneading process, and an organic solvent in a two-shaft continuous kneading and mixing machine. Thereafter a dispersion process is carried out on the diluted mixture, which results from the dilution kneading process.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: August 17, 1993
    Assignee: Fuji Photo Film Co. Ltd.
    Inventors: Tadashi Ishikuro, Haruo Masuda
  • Patent number: 5015498
    Abstract: A method for preparing a magnetic recording medium comprising a non-magnetic support having coated thereon a magnetic layer of a magnetic coating composition containing ferromagnetic metal particles and a binder, comprising at least (1) a step of mixing and dispersing ferromagnetic metal particles, a binder, and a solvent to prepare magnetic coating composition, (2) a step of adding and mixing lubricating agent therewith and (3) a step of coating the resulting magnetic coating composition on a non-magnetic support.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: May 14, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masashi Aonuma, Akira Kasuga, Haruo Masuda
  • Patent number: 4740419
    Abstract: A magnetic recording medium is described which has, on a non-magnetic support, a magnetic layer comprising a ferromagnetic substance dispersed in a binder, wherein the ferromagnetic substance is a hexagonal tabular ferromagnetic substance having an axis of easy magnetization in the direction perpendicular to the plain thereof and the ratio of the bulk density to true density (bulk densy/true density) is at least 0.16. The magnetic recording medium has improved output and C/N.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: April 26, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takamitsu Asai, Masaaki Fujiyama, Haruo Masuda
  • Patent number: 4356232
    Abstract: A method for producing a magnetic recording medium which comprises preparing a dispersion containing a ferromagnetic powder and a binder in the presence of non-alkali beads and coating the resulting dispersion on a non-magnetic support, and a magnetic recording medium obtained by the above method.
    Type: Grant
    Filed: April 10, 1981
    Date of Patent: October 26, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Tadokoro, Haruo Masuda, Nobutaka Yamaguchi, Masaaki Fujiyama
  • Patent number: 3936306
    Abstract: In a process for producing a gelatino silver halide light-sensitive material containing a high silver halide content comprising applying a gelatino silver halide emulsion layer having a silver halide to gelatin weight ratio of at least 0.8 and a gelatin-containing protective layer to a non-hygroscopic film support having good dimensional stability and then drying the layers, the improvement which comprises drying the layers on the support when the water content becomes less than 300% based on the mean drying amount defined as: ##EQU1## BY CONTACTING SAID MATERIAL WITH AIR HAVING A RELATIVE HUMIDITY OF FROM 50 TO 75%.
    Type: Grant
    Filed: June 28, 1974
    Date of Patent: February 3, 1976
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Minoru Minoda, Haruo Masuda, Mitsuru Suzuki, Hirohi Chikamasa