Patents by Inventor David A. Kopf

David A. Kopf 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).

  • Method and apparatus for the compression of audio, video or other data
    Patent number: 5825830
    Abstract: A data compression method utilizing a series of rules which are chosen for best compressing selected data. Rules are provided for converting each datum into a binary value, and encoding this binary value into a variable-width bit field. Rules are provided for automatically increasing or decreasing the binary field width which encodes the next data value, based on the current field width and encoded data value. An escape code is used to increase the field width for the next encoded value. A rule for efficient run-length encoding of repeated values or codes may also be included.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: October 20, 1998
    Inventor: David A. Kopf
  • Sextupole system for the correction of spherical aberration
    Patent number: 4303864
    Abstract: A means is provided for compensating for spherical aberration in charged particle beam devices. The means includes a sextupole positioned between two focusing lenses.
    Type: Grant
    Filed: October 25, 1979
    Date of Patent: December 1, 1981
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Albert V. Crewe, David A. Kopf