Patents by Inventor Patrick Henry Hool

Patrick Henry Hool 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 and method for prefilling secondary hydraulic circuits of a vehicular braking system
    Patent number: 5944068
    Abstract: An access port to a secondary circuit of a hydraulic braking system of a vehicle is provided in a hydraulic control unit. A prefilling apparatus for adding brake fluid to the secondary circuit includes a first device for evacuating and filling the secondary circuit with brake fluid. The first device includes a switchable valve connected to the access port, a pump, and a pressurized fluid reservoir. The prefilling apparatus also includes a second device for expelling trapped air from a pump of the hydraulic braking system. The second device includes a piston/cylinder arrangement connected to the access port, a source of pressurized air, and a fluid reservoir connected to the piston/cylinder arrangement. A connection tool and method for prefilling the secondary circuit utilizing this prefilling apparatus are also disclosed.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: August 31, 1999
    Assignee: Kelsey-Hayes Company
    Inventor: Patrick Henry Hool