Patents by Inventor John J. Frantzen

John J. Frantzen 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).

  • Abrasive tool
    Patent number: 4221084
    Abstract: An abrasive tool having a base portion with etched metal abrasive thereon and a handle portion adapted to snap onto the base in two alternate positions, one position being tight for using the etched metal abrasive and the other position being raised slightly to accomodate, between the handle and the base, a piece of sandpaper wrapped around the base.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: September 9, 1980
    Assignee: Minnesota Micro Metal, Inc.
    Inventor: John J. Frantzen
  • Television shadow mask and method of making same
    Patent number: 4174264
    Abstract: A color television shadow mask is constructed by electroforming metal onto a mask shaped base plate having a suitable resist pattern thereon.
    Type: Grant
    Filed: August 11, 1978
    Date of Patent: November 13, 1979
    Assignee: Neil B. Schulte
    Inventor: John J. Frantzen
  • Etching apparatus for accurately making small holes in thick materials
    Patent number: 4013498
    Abstract: A sheet of metallic material having a thickness T is covered on one side by an etchant resist and on the opposite side by an etchant resist and a removable shield. Etching is first performed on the side with only the etchant resist layer. Next, the shield is removed and the material is etched from both sides to produce an opening having a minimum dimension less than the thickness T of the material.
    Type: Grant
    Filed: September 29, 1975
    Date of Patent: March 22, 1977
    Assignee: Buckbee-Mears Company
    Inventors: John J. Frantzen, Lee C. Barton
  • Etching process for accurately making small holes in thick materials
    Patent number: 3971682
    Abstract: A sheet of metallic material having a thickness T is covered on one side by an etchant resist and on the opposite side by an etchant resist and a removable shield. Etching is first performed on the side with only the etchant resist layer. Next, the shield is removed and the material is etched from both sides to produce an opening having a minimum dimension less than the thickness T of the material.
    Type: Grant
    Filed: July 11, 1974
    Date of Patent: July 27, 1976
    Assignee: Buckbee-Mears Company
    Inventors: John J. Frantzen, Lee C. Barton