Patents by Inventor John R. Christianson

John R. Christianson 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: 10281274
    Abstract: A level and level-straightedge system is provided. The level may include one or more slip-resistant structure. The slip-resistant structure may be a collar formed from a high friction polymer material that at least partially surrounds a level vial. The collar may be co-molded with the material of the vial surround. The level may be a relatively small level having a length less than 14 inches and may include a groove for receiving a straightedge. The groove design alone or in combination with the collar may allow for a relatively short level to support a relatively long straightedge.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: May 7, 2019
    Assignee: Milwaukee Electric Tool Corporation
    Inventors: Daniel L. Block, John R. Christianson
  • Publication number: 20170370718
    Abstract: A level and level-straightedge system is provided. The level may include one or more slip-resistant structure. The slip-resistant structure may be a collar formed from a high friction polymer material that at least partially surrounds a level vial. The collar may be co-molded with the material of the vial surround. The level may be a relatively small level having a length less than 14 inches and may include a groove for receiving a straightedge. The groove design alone or in combination with the collar may allow for a relatively short level to support a relatively long straightedge.
    Type: Application
    Filed: June 12, 2017
    Publication date: December 28, 2017
    Inventors: Daniel L. Block, John R. Christianson
  • Publication number: 20110108428
    Abstract: A method for manufacture of a substantially flat rigid measurement tool of the type formed of a substantially non-ferrous lightweight anodized metal plate with measurement markings thereon. The inventive method includes the steps of anodizing the metal plate to create a dark anodized layer, forming the flat rigid measurement tool from the anodized metal plate, and creating non-removable substantially white measurement markings by oxidizing selected mark-areas of the dark anodized surface to a depth below the anodized layer. The markings are created by application of a laser energy. The metal plate contains aluminum and the non-removable substantially white markings are formed by oxidized aluminum.
    Type: Application
    Filed: November 6, 2009
    Publication date: May 12, 2011
    Applicant: EMPIRE LEVEL MFG. CORP.
    Inventors: JOHN R. CHRISTIANSON, CHARLES DUNN KIM
  • Patent number: D618120
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: June 22, 2010
    Assignee: Empire Level Mfg. Co.
    Inventors: Charles Dunn Kim, Steven Wayne Bockmann, John R. Christianson
  • Patent number: D623544
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: September 14, 2010
    Assignee: Empire Level Mfg. Co.
    Inventors: Charles Dunn Kim, Steven Wayne Bockmann, Ryan Sprouse Dart, John R. Christianson
  • Patent number: D628914
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: December 14, 2010
    Assignee: Empire Level Mfg. Corp.
    Inventors: Charles Dunn Kim, Steven Wayne Bockmann, John R. Christianson