Patents by Inventor Richard Frank Kerr

Richard Frank Kerr 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).

  • Direct modulation method for laser diode in a laser film printer
    Patent number: 5764664
    Abstract: A laser imaging apparatus comprising:a laser diode which is always operable in a linear lasing region;an amplitude modulator for amplitude modulating said laser diode for a digital image signal applied to said laser diode, when said digital image signal has a code value in a first range of code values in the mid to high range of signal code values; anda high speed pulse width modulator for pulse width modulating said laser diode when said digital signal, which is applied to said laser diode, has a code value in a second range of code values below said first range of code values, said laser diode being operated at a constant predetermined power level which is above the threshold power level of said laser diode.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: June 9, 1998
    Assignee: Eastman Kodak Company
    Inventors: Kwok Leung Yip, Richard Frank Kerr, Sreeram Dhurjaty