Patents by Inventor David L. Kershner

David L. Kershner 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 producing trivalent titanium coordination complex
    Patent number: 6093833
    Abstract: The disclosure describes a process for preparing a TiCl.sub.3 ether complex, such as TiCl.sub.3 (THF).sub.3, by reaction of corresponding TiCl.sub.4 ether complex with a metal powder, which produces a soluble metal chloride complex, in ether solvent. The TiCl.sub.3 ether complex that is prepared has a low aluminum content.
    Type: Grant
    Filed: January 14, 1999
    Date of Patent: July 25, 2000
    Assignee: Akzo Nobel N.V.
    Inventor: David L. Kershner
  • Copolymer of carbon monoxide and propylene and process for its formation
    Patent number: 5384393
    Abstract: A linear alternating copolymer of carbon monoxide and propylene, which is substantially free of ester and ether linkages, is formed by the catalyzed reaction of carbon monoxide and propylene in a ketone solvent medium (e.g., acetone). Acid end groups can be introduced if a mixture of water and ketone is used.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: January 24, 1995
    Assignee: Akzo Nobel N.V.
    Inventors: Paul K. Hanna, Andrzej M. Piotowski, David L. Kershner
  • Process for preparing polyketone using bis(diphenylphosphino) oxaalkane compound
    Patent number: 5270440
    Abstract: Polyketone compositions can be prepared by polymerizing carbon monoxide and at least one ethylenically unsaturated monomer using a catalyst system containing a palladium compound, an anion of a non-hydrohalogenic acid, and a phosphorus compound bidentate ligand, a bis(diphenylphosphino)oxaalkane compound which can have the formulae: ##STR1## where R is an alkylene bridging group.
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: December 14, 1993
    Assignee: Akzo nv
    Inventor: David L. Kershner
  • Copolymer of carbon monoxide and propylene produced in water/ketone solvent
    Patent number: 5270441
    Abstract: A linear alternating copolymer of carbon monoxide and propylene, which is substantially free of ester and ether linkages, is formed by the catalyzed reaction of carbon monoxide and propylene in a ketone solvent medium (e.g., acetone). Acid end groups can be introduced if a mixture of water and ketone is used.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: December 14, 1993
    Assignee: Akzo nv
    Inventors: Paul K. Hanna, Andrzej M. Piotrowski, David L. Kershner
  • Catalyst for synthesis of a polyketone
    Patent number: 5242878
    Abstract: Polyketones can be formed from carbon monoxide and at least one olefin by using, as a catalytic complex, a catalyst which comprises a Group VIII metal, an anion of an acid having a pK.sub.a of less than about four, and a tin tetradentate phosphine ligand, preferably of the formula Sn(RPR'.sub.2).sub.4 where R is methylene and R' is phenyl.
    Type: Grant
    Filed: April 8, 1992
    Date of Patent: September 7, 1993
    Assignee: Akzo N.V.
    Inventor: David L. Kershner