Patents by Inventor Yoshitsugu Itoh

Yoshitsugu Itoh 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).

  • Apparatus for purifying and dispensing water with stagnation preventing means
    Patent number: 4773993
    Abstract: An apparatus for producing pure water from raw water, comprises a reverse osmotic membrane unit, a polisher, an ultraviolet sterilizer, a high pressure pump for forcing raw water to flow through a reverse osmotic membrane in said reverse osmotic membrane unit to produce pure water permeated therethrough, and for feeding pure water to a use point, and a circulating line extending between said use point and a suction side of said high pressure pump for circulating pure water therebetween. With this construction, degradation of pure water due to stagnation is avoided.
    Type: Grant
    Filed: March 6, 1987
    Date of Patent: September 27, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Hiroaki Yoda, Minoru Kuroiwa, Yoshitsugu Itoh