Patents by Inventor Toshio Jojima

Toshio Jojima 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).

  • Sealing system for use in composite multi-stage pump
    Patent number: 4121839
    Abstract: A sealing system for use in a composite multi-stage pump or pumps is disclosed which utilizes part of the liquid pressurized by the pump to moderate sealing conditions by introducing said liquid to a portion or portions around the shaft, where the sealing conditions are most critical, and by thus reducing the pressure imposed on the sealing portion make the designing of seals easy. Also, by introducing pressurized liquid of relatively low temperature to the critical portion(s), minimum flow rate is lowered and thus the operational range of the pump is extended.When two or more pumps are employed for maintaining continuous operation by alternately switching the working pumps, a flow passage is provided between the pumps so the pressurized liquid from the pump under operation can be introduced to the non-operating pump, thus utilizing the pressurized liquid to prevent liquid kept under pressure in the non-operating pump from leaking therefrom.
    Type: Grant
    Filed: August 9, 1977
    Date of Patent: October 24, 1978
    Assignees: Mitsui Toatsu Chemicals, Inc., Toyo Engineering Corporation, Ebara Corporation
    Inventors: Shiro Takano, Toshio Jojima, Hajime Oshida, Tadashi Yokoi, Muneo Kato, Tadashi Koizumi