Patents by Inventor Edgar D. Sheh

Edgar D. Sheh 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).

  • System for driving ink jet transducers and method of operation
    Patent number: 5130720
    Abstract: A drive system for driving the transducers of an ink jet print head. A controller determines transducer activation periods during which one or more selected transducers are to be activated. During each transducer activation period a voltage source is activated. A drive circuit receives serial print data from the controller and couples the selected transducers to the voltage source. The voltage source can be provided with a waveshape circuit to produce a desired excitation waveshape.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: July 14, 1992
    Assignee: Dataproducts Corporation
    Inventors: Juan E. Lopez, Edgar D. Sheh