Patents by Inventor Raymond T. Tam

Raymond T. Tam 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).

  • Multiple boiler
    Patent number: 5228413
    Abstract: A multiple boiler has at least two separate heating systems incorporated therein. Whereas boilers with two heating supplies have been known, they have been complicated systems that require heating to occur outside a water tank. The multiple boiler has an insulated water tank with a heater to heat the water in the tank without circulating water outside the tank. At least one circulating coil is located in the tank in heat exchange relationship with water in the tank.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: July 20, 1993
    Inventor: Raymond T. Tam