Patents by Inventor Motoyuki Onozawa

Motoyuki Onozawa 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).

  • Air compressor
    Patent number: 5647731
    Abstract: An air compressor in which oil loss due to the pressure in the cylinder becoming negative during an unload can be prevented, thereby protecting an outlet-side unloader valve. An air leak hole with a specific ventilating resistance is formed between a valve body and a valve seat of an intake-side unloader valve when the intake-side unloader valve is closed. Also, a valve seat portion is provided, which cuts off a sliding portion of the outlet-side unloader valve from the outlet passage when the outlet-side unloader valve is opened.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: July 15, 1997
    Assignee: Zexel Corporation
    Inventor: Motoyuki Onozawa