Patents by Inventor Gerald J. W. Cairns

Gerald J. W. Cairns 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).

  • Nipple operated animal watering valve
    Patent number: 4320891
    Abstract: A nipple operated animal liquid valve having a valve body defining a passage through which liquid passes to be dispensed by the valve, and a passage closure selectively operable to close the passage, the closure having a nipple which may be operated by an animal to operate the valve.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: March 23, 1982
    Assignee: Howard Ingram Cairns
    Inventor: Gerald J. W. Cairns