Patents by Inventor Edgar Sheh

Edgar 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).

  • Patent number: 5142296
    Abstract: In an ink jet printer having a plurality of ink jet channels which are individually controllable to produce ink dots on a printing medium, crosstalk is reduced by activating each odd numbered channel in alternation with each even numbered channel, while offsetting the orifices of one group of channels from the other to compensate for the time difference between activations, and the voltage supplied to excite the channel transducers is varied as a function of the number of channels simultaneously exited to maintain a fixed excitation voltage across each transducer.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: August 25, 1992
    Assignee: Dataproducts Corporation
    Inventors: Juan E. Lopez, Edgar Sheh, Joe Lahut, Dung Do