Patents by Inventor Saburo Usui

Saburo Usui 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).

  • Direct-contact type hot water heater
    Patent number: 4765280
    Abstract: A direct-contact type hot water heater includes a perforated plate having a slope allowing water to flow down from its top apex toward its lower surroundings along both or all sides of the slope in the form of a water film. The perforated plate is provided with a number of apertures capable of forming the water film by surface tension. An endothermic material is arranged in a state where it does not project from the lower surface of the perforated plate.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: August 23, 1988
    Assignees: Maeda Iron Works Co., Ltd., Osaka Gas Co., Ltd.
    Inventors: Kunihiro Kobayashi, Saburo Usui, Shoji Otsuka, Choji Najima, Toshimichi Ohara