Patents by Inventor Logan L. Simpson

Logan L. Simpson 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).

  • Sulfonium salts and use and preparation thereof
    Patent number: 5047568
    Abstract: Sulfonium salts of the formula: ##STR1## wherein Ar is a fused aromatic radical; R.sub.1 is a divalent organic bridge; each R.sub.2 and R.sub.3 individually is an alkyl, aryl, alkaryl, aralkyl or substituted aryl, provided thatn not more than one of R.sub.2 and R.sub.3 is alkyl; and A is a non-nucleophilic anion; use thereof and preparation thereof.
    Type: Grant
    Filed: November 18, 1988
    Date of Patent: September 10, 1991
    Assignee: International Business Machines Corporation
    Inventors: Raymond W. Angelo, Jeffrey D. Gelorme, Joseph P. Kuczynski, William H. Lawrence, Socrates P. Pappas, Logan L. Simpson
  • Dry film, aqueous processable photoresist compositions
    Patent number: 5045431
    Abstract: A new polymer family is shown for use in high speed photoresists. A dry film photoresist includes a polymer binder prepared from t-butyl methacrylate/methylmethacrylate/acrylic acid/ethyl acrylate and a suitable initiator.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: September 3, 1991
    Assignee: International Business Machines Corporation
    Inventors: Robert D. Allen, Gregory M. Wallraff, Logan L. Simpson, William D. Hinsberg, III