Patents by Inventor D. M. Lewis

D. M. Lewis 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).

  • Salt free dyeing of cellulosic fibers with anionic dyes
    Patent number: 6350872
    Abstract: Quaternary ammonium compounds having at least two fiber reactive sites and at least two dye reactive sites, and processes for making and using the same are disclosed. The compounds of the invention can advantageously be used in a cellulosic fabric pretreatment process to allow anionic dyeing without requiring salt to exhaust or drive the dye into the cellulosic fiber.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: February 26, 2002
    Assignee: The Virkler Company
    Inventors: Howard E. Virkler, D. M. Lewis, Peter J. Broadbent