Patents by Inventor Paul D. Rovner

Paul D. Rovner 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 saving printer memory
    Patent number: 5850504
    Abstract: A page printer uses alternative internal representations for the print data in each of multiple lateral strips that make up the page. Page description language input is converted to an intermediate display list format that is sorted into display commands associated with each strip. If during input the display list representation of the data fills the memory allotted to its storage, one or more of the strips is converted from display list format to raster format and compressed using a lossless compression algorithm. If storage of compressed strips subsequently exceeds available memory, raster data is further compressed using a lossy compression algorithm. Additional display list commands are rasterized by decompressing the compressed strips, processing the new commands and recompressing the data using lossless or lossy compression as required. If the display list does not overflow memory during input, the complete strips are rasterized and compressed one at a time in the order in which they will be printed.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: December 15, 1998
    Assignee: Adobe Systems Incorporated
    Inventors: Michael David Cooper, Michael L. Hodgson, Patrick Swee-Hock Ong, James G. Sandman, Jr., Paul D. Rovner, Edward Reid Fiala
  • Method and apparatus for saving printer memory
    Patent number: 5602976
    Abstract: A page printer uses alternative internal representations for the print data in each of multiple lateral strips that make up the page. Page description language input is converted to an intermediate display list format that is sorted into display commands associated with each strip. If during input the display list representation of the data fills the memory allotted to its storage, one or more of the strips is converted from display list format to raster format and compressed using a lossless compression algorithm. If storage of compressed strips subsequently exceeds available memory, raster data is further compressed using a lossy compression algorithm. Additional display list commands are rasterized by decompressing the compressed strips, processing the new commands and recompressing the data using lossless or lossy compression as required. If the display list does not overflow memory during input, the complete strips are rasterized and compressed one at a time in the order in which they will be printed.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: February 11, 1997
    Assignee: Adobe Systems Incorporated
    Inventors: Michael D. Cooper, Michael L. Hodgson, Patrick S.-H. Ong, James G. Sandman, Jr., Paul D. Rovner, Edward R. Fiala