Patents by Inventor Thomas W. Weir

Thomas W. Weir 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 for purifying N-methyl-2-pyrrolidone
    Patent number: 7153978
    Abstract: A method for purifying N-methyl-2-pyrrolidone is disclosed. The method comprises treating N-methyl-2-pyrrolidone with an alumina that desorbs less than 100 ?mol/g of isobutylene between 225° C. and 400° C. in a standard tert-butyl alcohol dehydration test. The method enables the removal of at least about 80% of amine impurities or at least about 60% of APHA color from the NMP at 4 bed volumes treated.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: December 26, 2006
    Assignee: Lyondell Chemical Technology, L.P.
    Inventors: Andrew P. Kahn, Thomas W. Weir
  • Process for the preparation of a propylene glycol antifreeze containing an alkali metal silicate
    Patent number: 5651916
    Abstract: The preparation of propylene glycol compositions containing alkali metal silicates having improved gel resistance is provided by forming a silicate premix having effective amounts of inorganic base compound(s) and water. The silicate premix is then added to the propylene glycol.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: July 29, 1997
    Assignee: Prestone Products Corporation
    Inventor: Thomas W. Weir