Patents by Inventor Robert H. VanderWerf

Robert H. VanderWerf 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).

  • Four way corner level
    Patent number: 4168578
    Abstract: A four way corner level is provided with a first run, a second run extending perpendicular to the first run, and a third run terminating in a handle member extending from the external apex of the first and second runs. Vertical and horizontal level means are provided on the external sides of the first and second runs and magnetic attaching means may be provided on the internal sides of the first and second runs.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: September 25, 1979
    Assignee: Vy-Dawn, Incorporated
    Inventor: Robert H. VanderWerf
  • Four way corner level
    Patent number: D253581
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: December 4, 1979
    Assignee: Vy-Dawn, Inc.
    Inventor: Robert H. Vanderwerf
  • Spirit level vial container
    Patent number: D255504
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: June 24, 1980
    Assignee: Vy-Dawn, Incorporated
    Inventor: Robert H. Vanderwerf
  • Corner level
    Patent number: D257330
    Type: Grant
    Filed: December 28, 1978
    Date of Patent: October 14, 1980
    Assignee: Vy-Dawn, Inc.
    Inventor: Robert H. VanderWerf
  • Corner level
    Patent number: D261626
    Type: Grant
    Filed: October 24, 1979
    Date of Patent: November 3, 1981
    Inventor: Robert H. VanderWerf
  • Four way corner level
    Patent number: D288539
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: March 3, 1987
    Inventor: Robert H. VanderWerf
  • Four way corner level
    Patent number: D288540
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: March 3, 1987
    Inventor: Robert H. VanderWerf
  • Four way corner level
    Patent number: D288541
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: March 3, 1987
    Inventor: Robert H. VanderWerf