Patents by Inventor David L. Boutle

David L. Boutle 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).

  • Photopolymerizable element having initiator in adhesive layer
    Patent number: 4289843
    Abstract: A photopolymerizable element suitable for use in the production of photorelief printing plates comprises a film or sheet, an adhesive layer and a photopolymerizable layer wherein the adhesive layer comprises a non-photopolymerizable plastics binder and a photopolymerization initiator comprising an admixture of a compound of the formula: ##STR1## preferably 4,4'-bis(dimethylamino)-benzophenone in an amount 0.01 to 2.0% by weight based upon the weight of the binder and another photopolymerization initiator in an amount 0.1 to 7% by weight based upon the weight of the binder.
    Type: Grant
    Filed: November 21, 1978
    Date of Patent: September 15, 1981
    Assignee: Bexford Limited
    Inventors: David L. Boutle, Stuart C. Rennison, Stuart G. Lambert
  • Production of porous materials
    Patent number: 4242464
    Abstract: An improved microporous polymer material is made by coagulating, e.g. in water, a polymer solution containing dispersed microscopic particles of a removable filler soluble in a coagulating liquid.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: December 30, 1980
    Assignee: Poryair Limited
    Inventor: David L. Boutle
  • Production of porous materials
    Patent number: 4157424
    Abstract: An improved microporous polymer material is made by coagulating, e.g. in water, a polymer solution containing dispersed microscopic particles of a removable filler soluble in a coagulating liquid.
    Type: Grant
    Filed: November 23, 1971
    Date of Patent: June 5, 1979
    Assignee: Porvair Limited
    Inventor: David L. Boutle