Patents by Inventor Richard Allan VanDahm

Richard Allan VanDahm 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: 6342641
    Abstract: Purified bisphenol A ethoxylates are provided which are produced through the base-catalyzed addition of ethylene oxide to a bisphenol A. The purification step involves the neutralization with a mineral acid (namely phosphoric acid) and subsequent treatment with a colloidal metal silicate. The neutralization step removes substantially all of the excess cation (or salt) of the base catalyst to produce a uniformly low salt content bisphenol A ethoxylate. Such a low-salt product is thus easy to produce in continuously high yields. The process itself is also encompassed within this invention.
    Type: Grant
    Filed: May 10, 2000
    Date of Patent: January 29, 2002
    Assignee: Milliken & Company
    Inventors: Richard Allan VanDahm, Ricky Lee Ritz