Patents by Inventor Yoshito Tokunaga

Yoshito Tokunaga 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).

  • Battery containing foam polyurethane resin and method of making
    Patent number: 5352545
    Abstract: A sealed lead acid battery including a container; a cover connected to the container; a plurality of plate groups disposed in the container, each of the plate groups comprising a plurality of pairs of positive plates and negative plates separated, each from the other, by separators; an upper space within the container extending from the plates to the cover; a pair of straps disposed in the upper space; each of the plates having an upstanding lug; each of the lugs extending from the negative plates being connected to one of the straps; each of the lugs extending from the positive plates being connected to the other of the straps; and foam polyurethane resin filling a sufficient amount of the upper space to control the possibility of an explosion occurring due to the collection of gases within the container, the foam polyurethane having an apparent specific gravity of from 2 g/l to 50 g/l and an open cell structure.
    Type: Grant
    Filed: January 27, 1993
    Date of Patent: October 4, 1994
    Assignee: Yuasa Corporation
    Inventors: Hiroshi Furukawa, Yoshito Tokunaga