Patents by Inventor Albert Carpenter

Albert Carpenter 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).

  • One-pot process for the preparation of 5-sulfonyl-substituted benzotriazoles UV absorbers
    Patent number: 6040455
    Abstract: 5-Sulfonyl substituted benzotriazole UV absorbers are prepared from the corresponding 5-chlorobenzotriazole in a two step, but one-pot process where the second step involves the oxidation of the non-isolated 5-thio substituted benzotriazole using sodium tungstate, hydrogen peroxide and formic acid. The 5-sulfonyl substituted benzotriazoles exhibit enhanced absorption in the near-visible range (over 350 nm) thus providing effective protection to substrates in this critical area of the spectrum.
    Type: Grant
    Filed: January 21, 1999
    Date of Patent: March 21, 2000
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Mervin G. Wood, William Wiggins, Catherine Blake, Albert Carpenter, Wha Chen