Patents Assigned to Christianson Manufacturing Corp.
  • Internal action improved gas powered umbrella
    Patent number: 4766920
    Abstract: A device is disclosed whereby both the opening and the closing of a device commonly known as an umbrella is accomplished automatically.
    Type: Grant
    Filed: February 13, 1984
    Date of Patent: August 30, 1988
    Assignee: Christianson Manufacturing Corp.
    Inventor: Clyde C. Grady, II