Patents by Inventor Donald R. Callentine

Donald R. Callentine 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).

  • Drive motor reversal for a barrier operator or the like
    Patent number: 7525265
    Abstract: Methods and apparatus for reversing a drive motor for a barrier movement operator are disclosed. The operator senses the nature of a request for reversal and based on the nature of the sensed request performs one of a plurality of processes to reverse the motor.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: April 28, 2009
    Assignee: The Chamberlain Group, Inc.
    Inventors: Donald R. Callentine, Thomas J. Jankovsky