Patents by Inventor Masakazu Achikita

Masakazu Achikita 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: 5250254
    Abstract: A compound for producing sintered parts in an injection molding process and the molding process used to form the parts. The compound contains materials that allow the parts to be formed at lower temperatures and higher production rates when compared to more conventional processes.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: October 5, 1993
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Masakazu Achikita, Akihito Ohtsuka
  • Patent number: 5135977
    Abstract: A powder metallurgy product delicate in shape is obtained with high efficiency in binder expulsion by using an injection molding composition including a sintering alumina powder and a binder, the binder including therein, in gravimetric ratio, 10 to 80% of a low-density polyethylene, 10 to 80% of a paraffin type wax and 5 to 35% of a boric ester, and the volumetric mixing ratio of the sintering powder to the binder is 30 to 70% of the former component to 70 to 30% of the latter component.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: August 4, 1992
    Assignee: Sumitomo Metal Mining Company, Ltd.
    Inventors: Masakazu Achikita, Akihito Ohtsuka
  • Patent number: 5091022
    Abstract: There is disclosed a method for manufacturing intricate shaped magnetic parts having excellent soft magnetic characteristics which includes forming powders of Fe and P having particle sizes less than 45 .mu.m; mixing 0.1 to 1.0% by weight P powder with Fe powder; adding a binder; injection-molding the mixture at 1200 kg/cm.sup.2 ; removing the binder by heating; sintering the binder free part at 1200.degree.-1400.degree. C. for 30-180 min; and cooling the sintered part at a rate of less than 50.degree. C./min.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: February 25, 1992
    Assignee: Sumitomo Metal Mining Company, Limited
    Inventors: Masakazu Achikita, Akihito Ohtsuka
  • Patent number: 5080714
    Abstract: A compound for producing sintered parts in an injection molding process and the molding process used to form the parts. The compound contains materials that allow the parts to be formed at lower temperatures and higher production rates when compared to more conventional processes.
    Type: Grant
    Filed: July 18, 1990
    Date of Patent: January 14, 1992
    Inventors: Masakazu Achikita, Akihito Ohtsuka
  • Patent number: 5032355
    Abstract: A method of manufacturing a sintering product of Fe-Co alloy soft magnetic material by molding a powder comprising from 40 to 60% by weight of Co and the substantial balance of Fe, sintering the molding product and then applying heat treatment, wherein cooling after the heat treatment is conducted as slow cooling at a cooling rate of not more than 50.degree. C./min.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: July 16, 1991
    Assignee: Sumitomo Metal Mining Company Limited
    Inventors: Masakazu Achikita, Akihito Ohtsuka, Shinichi Sogame
  • Patent number: 5030677
    Abstract: Disclosed is a composition for injection moulding which is composed of a sinterable powder comprising at least one metal or alloy and a binder. The binder contains from 10 to 80% by weight of a low-density polyethylene from 10 to 80% by weight of a paraffin wax and from 5 to 35% by weight of a boric acid ester. The ratio of the sinterable powder to the binder in the composition is from 30 to 70% by volume of the former and from 70 to 30% by volume of the latter. The binder can be removed from the green body to be prepared by injection-moulding the composition unexpectedly rapidly without interfering with the properties of the final product sintered.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: July 9, 1991
    Assignee: Sumitomo Metal Mining Company Limited
    Inventors: Masakazu Achikita, Akihito Ohtsuka
  • Patent number: 5002728
    Abstract: A method of manufacturing a soft magnetic Fe-Si alloy sintered product comprising a step of injection molding a composition comprising an Fe-Si powder mixture blended so as to contain from 1 to 10% by weight of Si and the substantial balance of Fe and a binder a step of applying binder-removal under heating to the resultant green body and applying a degassing and Si-diffusing; and a step of subsequently applying sintering. The sintered product is, preferably, applied with further heating for obtaining better soft magnetic property. Soft magnetic property of the sintered products is as comparable with or superior to products by conventional powder metallurgy.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: March 26, 1991
    Assignee: Sumitomo Metal Mining Company, Ltd.
    Inventors: Masakazu Achikita, Shinichi Sogame