Patents by Inventor Shingo Hirosawa

Shingo Hirosawa 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).

  • Variable capacity type gear pump
    Patent number: 4022551
    Abstract: This invention relates to a variable capacity type gear pump which is capable of operating efficiently by flowing out by-passed liquid under extremely low pressure to adjust or control the amount of feed-out liquid. This is accomplished by providing the walls of the casing (housing) of the gear pump with ports or slits, which ports or slits are connected to a controlling valve in order to remove the desired amount of by-passed liquid.
    Type: Grant
    Filed: November 6, 1975
    Date of Patent: May 10, 1977
    Assignee: Aikoh Co., Ltd.
    Inventor: Shingo Hirosawa