Patents by Inventor Christopher William McDonald

Christopher William McDonald 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).

  • Flow restriction device
    Patent number: 5868163
    Abstract: A flow control device (40) which is to be inserted in the valve seat of a tap. The flow control device (40) includes a threaded section (48) to threadably engage an associated tap within which the device (40) is located. The device (40) includes a passage (42) which terminates internally of the body (43). Passages (44) radiate from the passage (45) through the body to a peripheral surface (45). The end face (47) of the device (40) is intended to be engaged by the washer of the tap.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: February 9, 1999
    Inventor: Christopher William McDonald