Patents by Inventor Paul Gerald Pringle

Paul Gerald Pringle 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 the telomerization of a conjugated diene, catalyst and bidentate ligand useful therein
    Patent number: 7491859
    Abstract: Process for the telomerization of a conjugated diene, wherein the conjugated diene is reacted with a compound containing an active hydrogen atom and having a formula R?—H in the presence of a telomerization catalyst based on: (a) a source of group VIII metal, (b) a bidentate ligand wherein the bidentate ligand has the general formula I R1R2M1-R-M2R3R4??(I) wherein M1 and M2 are independently P, As or Sb; R1, R2, R3 and R4 independently represent a monovalent aliphatic group; or R1, R2 and M1 together and/or R3, R4 and M2 together independently represent an optionally substituted aliphatic cyclic group with at least 5 ring atoms, of which one is the M1 or M2 atom, respectively; R represents a bivalent organic bridging group; and novel bidentate diphosphines which can be used in this process.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: February 17, 2009
    Assignee: Shell Oil Company
    Inventors: Eit Drent, Michael Rolf Eberhard, Paul Gerald Pringle, Renata Helena van der Made
  • Process for the telomerization of a conjugated diene, catalyst and bidentate ligand useful therein
    Patent number: 7057082
    Abstract: Process for the telomerization of a conjugated diene, wherein the conjugated diene is reacted with a compound containing an active hydrogen atom and having a formula R?—H in the presence of a telomerization catalyst based on: (a) a source of group VIII metal, (b) a bidentate ligand wherein the bidentate ligand has the general formula I R1R2M1—R—M2R3R4??(I) wherein M1 and M2 are independently P, As or Sb; R1, R2, R3 and R4 independently represent a monovalent aliphatic group; or R1, R2 and M1 together and/or R3, R4 and M2 together independently represent an optionally substituted aliphatic cyclic group with at least 5 ring atoms, of which one is the M1 or M2 atom, respectively; R represents a bivalent organic bridging group; and novel bidentate diphosphines which can be used in this process.
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: June 6, 2006
    Assignee: Shell Oil Company
    Inventors: Eit Drent, Michael Rolf Eberhard, Paul Gerald Pringle, Renata Helena van der Made
  • Process for the telomerization of a conjugated diene, catalyst and bidentate ligand useful therein
    Publication number: 20040242949
    Abstract: Process for the telomerization of a conjugated diene,
    Type: Application
    Filed: July 1, 2004
    Publication date: December 2, 2004
    Inventors: Eit Drent, Michael Rolf Eberhard, Paul Gerald Pringle, Renata Helena van der Made
  • Process for the telomerization of a conjugated diene, catalyst and bidentate ligand useful therein
    Patent number: 6794553
    Abstract: Process for the telomerization of a conjugated diene, wherein the conjugated diene is reacted with a compound containing an active hydrogen atom and having a formula R′—H in the presence of a telomerization catalyst based on: (a) a source of group VIII metal, (b) a bidentate ligand wherein the bidentate ligand has the general formula I R1R2M1—R—M2R3R4  (I) wherein M1 and M2 are independently P, As or Sb; R1, R2, R3 and R4 independently represent a monovalent aliphatic group; or R1, R2 and M1 together and/or R3, R4 and M2 together independently represent an optionally substituted aliphatic cyclic group with at least 5 ring atoms, of which one is the M1 or M2 atom, respectively; R represents a bivalent organic bridging group; and novel bidentate diphosphines which can be used in this process.
    Type: Grant
    Filed: November 4, 2002
    Date of Patent: September 21, 2004
    Assignee: Shell Oil Company
    Inventors: Eit Drent, Michael Rolf Eberhard, Paul Gerald Pringle, Renata Helena van der Made
  • Process for the telomerization of a conjugated diene, catalyst and bidentate ligand useful therein
    Publication number: 20030130544
    Abstract: Process for the telomerization of a conjugated diene,
    Type: Application
    Filed: November 4, 2002
    Publication date: July 10, 2003
    Inventors: Eit Drent, Michael Rolf Eberhard, Paul Gerald Pringle, Renata Helena van der Made