Patents by Inventor Ernest R. Novak

Ernest R. Novak 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).

  • Polyacetal resins containing non-meltable polymer stabilizers
    Patent number: 5011890
    Abstract: Incorporation into polyacetal molding compositions of 0.05-3 weight percent of certain non-meltable polymers containing formaldehyde reactive hydroxyl groups, formaldehyde reactive nitrogen groups, or formaldehyde reactive hydroxyl and formaldehyde reactive nitrogen groups, wherein the polymer has an average particle size, both prior to melt processing with the polyacetal and after melt processing with the polyacetal, of less than 10 microns, results in improved thermal stability of such compositions.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: April 30, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Ernest R. Novak
  • Stabilized polyacetal compositions
    Patent number: 4814397
    Abstract: Incorporation of 0.1-10 weight percent of certain polymers and/or oligomers containing both hydroxy groups and at least one other functional group that is a stronger Lewis base than the hydroxy groups into polyacetal molding compositions results in improved thermal stability of such compositions.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: March 21, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ernest R. Novak
  • Polyamide compositions toughened with crosslinked acrylic rubber
    Patent number: 4474927
    Abstract: Polyamide toughening crosslinked acrylic rubbers having an outer layer of an alkyl acrylate and a polyamide graft-linking monomer, this outer layer having a glass transition temperature of less than about 20.degree. C.
    Type: Grant
    Filed: December 16, 1981
    Date of Patent: October 2, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ernest R. Novak
  • Process for polymerizing methyl methacrylate syrup using a dual initiator system
    Patent number: 4328329
    Abstract: Polymerization of a methyl methylacrylate polymer syrup is carried out using a dual initiator system of tertiary C.sub.4 - or tertiary C.sub.5 -peroxyneodecanoate and 2,2'-azobis(isobutyronitrile).
    Type: Grant
    Filed: December 11, 1980
    Date of Patent: May 4, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ernest R. Novak
  • Preparation of thermoformable methyl methacrylate sheets
    Patent number: 4152506
    Abstract: In casting methacrylate sheets for thermoforming applications, it has heretofore been the practice to add chain transfer agents to the polymerization mix for forming syrup. It has now been found that addition of chain transfer agent can be delayed until after the syrup has been prepared with no loss in thermoformability of sheets prepared from the syrup.
    Type: Grant
    Filed: April 26, 1978
    Date of Patent: May 1, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ernest R. Novak