Patents by Inventor Thomas J. Drennen

Thomas J. Drennen 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).

  • Process for controlling pitch in papermaking
    Patent number: 4190491
    Abstract: A process for preventing deposition of pitch in papermaking comprising incorporating in a paper pulp slurry a water-soluble linear cationic polymer comprised of units of the formula ##STR1## wherein A is a (C.sub.2 -C.sub.3) alkylene group,R is H or CH.sub.3 ;R.sup.1 is a hydroxyethyl or hydroxypropyl group,R.sup.2 is a (C.sub.1 -C.sub.4) alkyl group,R.sup.3 is a (C.sub.1 -C.sub.4) alkyl group, andX is an anion;said polymer having a viscosity average molecular weight of about 35,000 to 70,000.
    Type: Grant
    Filed: August 24, 1978
    Date of Patent: February 26, 1980
    Assignee: Rohm and Haas Company
    Inventors: Thomas J. Drennen, Robert A. Gill