Patents by Inventor H. Charles Buchanan, Jr.

H. Charles Buchanan, Jr. 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).

  • Patent number: 4823058
    Abstract: A vehicle window wiper control activates an electric motor to drive the wiper through repeating cycles of a wipe pattern on a vehicle window. In the pause mode, a first wiper position responsive switch provides a pause at both inner and outer wipe positions, one at each end of the wipe pattern. In the off mode, however, the final wipe cycle is completed through a second wiper position responsive switch which is open only in the inner wipe position and is connected in parallel with the first wiper position responsive switch to shunt it at the outer wipe position, so that the wiper is parked only in the inner wipe position. The wiper position responsive switches are multiple stationary contacts tracing circular paths of differing radii on a conducting plate with non-conducting portions which rotates with wiper movement. The division of total pause time into two pauses per wipe cycle allows a halving of the RC time constant in the pause timer, with cost and/or reliability benefits.
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: April 18, 1989
    Assignee: General Motors Corporation
    Inventors: H. Charles Buchanan, Jr., Richard E. Wainwright