Patents by Inventor Charles L. Harrington

Charles L. Harrington 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: 3983896
    Abstract: An underground valve has an operating rod extending above the ground which may be rotated to shut the valve off or turn the valve on. Difficulty with freezing prevents the valve operation at certain times during the winter months and by having the rod located within an external protective tube and sealed therein by a cylindrical element which is rotatable with the rod relative to the tube, whereby the operating rod for the valve can always be rotated since no ground water can get into the tube which extends below the frost line and above the ground.
    Type: Grant
    Filed: June 24, 1975
    Date of Patent: October 5, 1976
    Assignee: Wigma Corporation
    Inventor: Charles L. Harrington
  • Patent number: 3976141
    Abstract: After the sprinkler heads alone or with other means has put out a fire, applicant's device is extremely useful for shutting off the flow of water from the heads to minimize the damage resulting from the continuous flow of water. The device is effective to shut off the water from the sprinkler heads whether or not the heads are mounted so that the opening is located at the top or bottom or with heads having openings at the top and also openings at the bottom. The device is so constructed as to seal off either type of opening when applied to a sprinkler head.
    Type: Grant
    Filed: June 24, 1975
    Date of Patent: August 24, 1976
    Assignee: Wigma Corporation
    Inventor: Charles L. Harrington