Patents by Inventor John G. Paul

John G. Paul 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).

  • Photopolymerisation process with two exposures of a single layer
    Patent number: 4440850
    Abstract: A layer of a liquid composition containing a compound (A) having in the same molecule at least one (meth)acryloyl group and at least one bicyclo[2.2.1]hept-2-ene-6-yl unit is exposed to actinic radiation so that the layer solidifies due to photopolymerisation of (A) through the (meth)acryloyl group(s), remaining, however, photocrosslinkable. When desired, the solidified layer is exposed, as through a negative, to a substantially greater amount of actinic radiation, the parts so further exposed becoming more highly photocrosslinked through the bicyclo[2.2.1]hept-2-ene-6-yl unit(s) and hence insoluble. An image is produced which can be developed by means of suitable solvents. Examples of (A) include 3-(methacryloyloxy)-2-hydroxypropyl bicyclo[2.2.1]hept-2-ene-6-carboxylate and 2-(acryloyloxy)ethyl methyl-5-carboxybicyclo[2.2.1]hept-2-ene-6-carboxylate.
    Type: Grant
    Filed: July 12, 1982
    Date of Patent: April 3, 1984
    Assignee: Ciba-Geigy Corporation
    Inventors: John G. Paul, Bernard P. Stark, Ewald Losert
  • Photopolymerization process employing compounds containing acryloyl groups and maleimide groups
    Patent number: 4416975
    Abstract: In a three stage process, a layer of a liquid composition containing a compound (A) having in the same molecule at least one (meth)acryloyl group and at least one 2,3-disubstituted maleimido group is exposed to actinic radiation so that the layer solidifies due to photopolymerization of (A) through the (meth)acryloyl group(s), remaining, however, further photocrosslinkable. When desired, the solidified layer is exposed, as through a negative, to a substantially greater amount of actinic radiation, the parts so further exposed becoming more highly photocrosslinked through the disubstituted maleimido group(s) and hence insoluble. An image is produced which can be developed by means of suitable solvents. Examples of (A) include N-(2-(acryloyloxy)ethyl)-2,3-dimethylmaleimide and N-(3-(methacryloyloxy)-2-hydroxypropyl)-2,3-dimethylmaleimide.
    Type: Grant
    Filed: March 25, 1982
    Date of Patent: November 22, 1983
    Assignee: Ciba-Geigy Corporation
    Inventors: George E. Green, Ewald Losert, John G. Paul, Hans Zweifel
  • Photopolymerization process employing compounds containing acryloyl group and anthryl group
    Patent number: 4413052
    Abstract: In a three stage process, a layer of a liquid composition containing a compound (A) having in the same molecule both at least one (meth)acryloyl group and at least one anthryl group is exposed to actinic radiation so that the layer solidifies due to photopolymerization of (A) through the (meth)acryloyl group(s), remaining, however, further photocrosslinkable. When desired, the solidified layer is exposed, as through a negative, to a substantially greater amount of actinic radiation, the parts so further exposed becoming more highly photocrosslinked through the anthryl group(s) and hence insoluble. An image is produced which can be developed by means of suitable solvents. Examples of (A) include 3-(acryloyloxy)-2-hydroxypropyl anthracene-9-carboxylate and its methacryloyl homologue.
    Type: Grant
    Filed: March 25, 1982
    Date of Patent: November 1, 1983
    Assignee: Ciba-Geigy Corporation
    Inventors: George E. Green, Ewald Losert, John G. Paul