Patents by Inventor Francis J. Caldwell

Francis J. Caldwell 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).

  • Heat control for a dishwashing machine
    Patent number: 4689089
    Abstract: A dishwashing machine and a method for washing ware therewith are disclosed. The machine includes a wash chamber, a tank for holding a cleansing liquid, a spray system including a selectively operable pump for spraying ware to be cleaned with liquid from the tank, and a heater for heating the liquid within the tank. The heater is regulated to maintain the liquid substantially at a first predetermined temperature whenever the pump is operating, and to maintain the liquid substantially at a second predetermined temperature greater than the first temperature whenever the pump is not operating.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: August 25, 1987
    Assignee: Hobart Corporation
    Inventors: Mark E. Eberhardt, Jr., Francis J. Caldwell