Patents by Inventor Jos P. Wristers

Jos P. Wristers 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 to alkylate an aromatic with a dilute stream comprising propylene and ethylene
    Patent number: 6063976
    Abstract: The present invention provides a method comprising (a) contacting a first reaction mixture comprising an aromatic and a dilute stream comprising ethylene and propylene with a large pore microporous solid acid catalyst, preferably a large pore zeolite catalyst, which is effective to promote alkylation of the aromatic under first conditions effective to maintain a liquid phase comprising the aromatic and effective to cause the propylene to alkylate said aromatic but substantially ineffective to cause the ethylene to alkylate said aromatic, forming propylated aromatic and a second dilute stream comprising ethylene but substantially depleted of propylene, and (b) recovering the propylated aromatic.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: May 16, 2000
    Assignee: Exxon Chemical Patent Inc.
    Inventors: Dan E. Hendriksen, James R. Lattner, Jos P. Wristers
  • Inhibiting popcorn polymer formation with sulfur-containing compounds
    Patent number: 5345030
    Abstract: Inhibition of popcorn polymer growth by treatment with a sulfur-containing compound. The sulfur-containing compound can be added to organic material from which popcorn polymer is formed, or applied to extant popcorn polymer.
    Type: Grant
    Filed: March 11, 1993
    Date of Patent: September 6, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Hsiang-ning Sun, John J. Cikut, Roque V. Martir, Jos P. Wristers
  • Inhibiting popcorn polymer formation with sulfur-containing compounds
    Patent number: 5196619
    Abstract: Inhibition of popcorn polymer growth by treatment with a sulfur-containing compound. The sulfur-containing compound can be added to organic material from which popcorn polymer is formed, or applied to extant popcorn polymer.
    Type: Grant
    Filed: January 29, 1991
    Date of Patent: March 23, 1993
    Inventors: Hsiang-ning Sun, John J. Cikut, Roque V. Martir, Jos P. Wristers