Patents by Inventor Yozaburu Umehara

Yozaburu Umehara 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).

  • Tape guide apparatus
    Patent number: 4313551
    Abstract: A tape guide pin for recording and/or reproducing apparatus includes a base body made of non-magnetic material; and a surface layer formed on the base body, made of non-magnetic hard material, the surface layer having the surface roughness whose microscopic tips are rounded. A method of manufacturing the tape guide pin for recording and/or reproducing apparatus includes the steps of: forming a base body of non-magnetic material; forming a surface layer of non-magnetic hard material on the base body; subjecting the base body and/or the surface layer to surface treatment for dimensional accuracy of circumferential surface; and fine-finishing for rounding the microscopic tips of the surface roughness formed by the surface treatment for dimensional accuracy.
    Type: Grant
    Filed: September 25, 1980
    Date of Patent: February 2, 1982
    Inventor: Yozaburu Umehara
  • Tape guide means for recording and/or reproducing apparatus and method of manufacturing the same
    Patent number: 4228940
    Abstract: A tape guide pin for recording and/or reproducing apparatus includes a base body made of non-magnetic material; and a surface layer formed on the base body, made of non-magnetic hard material, the surface layer having the surface roughness whose microscopic tips are rounded. A method of manufacturing the tape guide pin for recording and/or reproducing apparatus includes the steps of: forming a base body of non-magnetic material; forming a surface layer of non-magnetic hard material on the base body; subjecting the base body and/or the surface layer to surface treatment for dimensional accuracy of circumferential surface; and fine-finishing for rounding the microscopic tips of the surface roughness formed by the surface treatment for dimensional accuracy.
    Type: Grant
    Filed: September 7, 1978
    Date of Patent: October 21, 1980
    Inventor: Yozaburu Umehara