Patents by Inventor Dennis G. Peiffer

Dennis G. Peiffer 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).

  • Patent number: 7708151
    Abstract: This invention relates to a polymeric membrane composition utilizing the non-hazardous compound 4-aminophenyl disulfide (“APD”), a method of making the polymeric membrane, and a process for separating components of a feedstream utilizing the polymeric membrane. More particularly, but not by way of limitation, this invention relates to utilizing the polymeric membrane composition in a process for the separation of aromatics from a hydrocarbon feedstream containing aromatics and aliphatic compounds.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: May 4, 2010
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Dennis G. Peiffer, Randall D. Partridge, Walter Weissman, David C. Dalrymple, Craig Y. Sabottke
  • Patent number: 7677332
    Abstract: A method and system for drilling a wellbore is described. The system includes a wellbore with a variable density drilling mud, drilling pipe, a bottom hole assembly disposed in the wellbore and a drilling mud processing unit in fluid communication with the wellbore. The variable density drilling mud has compressible particles and drilling fluid. The bottom hole assembly is coupled to the drilling pipe while the drilling mud processing unit is configured to separate the compressible particles from the variable density drilling mud. The compressible particles in this embodiment may include compressible hollow objects filled with pressurized gas an configured to maintain the mud weight between the fracture pressure gradient and the pore pressure gradient. In addition, the system and method may also manage the use of compressible particles having different characteristics, such as size, during the drilling operations.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: March 16, 2010
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Paul Matthew Spiecker, Pavlin B. Entchev, Ramesh Gupta, Richard Polizzotti, Barbara Carstensen, Dennis G. Peiffer, Norman Pokutylowicz
  • Publication number: 20100062186
    Abstract: A ultra-thin polymeric membrane is made by coating a porous substrate, such as a ceramic monolith, with a solution of a polymer colloid, then drying the solution to form the film. The polymer is an associating polymer. The resulting membrane may be used for separating hydrocarbon species, for example.
    Type: Application
    Filed: June 23, 2009
    Publication date: March 11, 2010
    Inventors: Dennis G. Peiffer, Randall D. Partridge, Walter Weissman, David C. Dalrymple
  • Publication number: 20090050374
    Abstract: A method and system for drilling a wellbore is described. The system includes a wellbore with a variable density drilling mud, drilling pipe, a bottom hole assembly disposed in the wellbore and a drilling mud processing unit in fluid communication with the wellbore. The variable density drilling mud has compressible particles and drilling fluid. The bottom hole assembly is coupled to the drilling pipe while the drilling mud processing unit is configured to separate the compressible particles from the variable density drilling mud. The compressible particles in this embodiment may include compressible hollow objects filled with pressurized gas an configured to maintain the mud weight between the fracture pressure gradient and the pore pressure gradient. In addition, the system and method may also manage the use of compressible particles having different characteristics, such as size, during the drilling operations.
    Type: Application
    Filed: February 13, 2007
    Publication date: February 26, 2009
    Inventors: Paul Matthew Spiecker, Pavlin B. Entchev, Ramesh Gupta, Richard Polizzotti, Barbara Carstensen, Dennis G. Peiffer, Norman Pokutylowicz
  • Publication number: 20080237129
    Abstract: This invention relates to a process for recycling acid used to remove nitrogen contaminants from hydrocarbons using polymeric membranes to separate spent acid from the acid extraction of hydrocarbons into acid for recycle and acid for regeneration.
    Type: Application
    Filed: December 1, 2004
    Publication date: October 2, 2008
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: Bhupender S. Minhas, Dennis G. Peiffer, Jeffrey S. Beck, David L. Stern, Tomas R. Melli
  • Publication number: 20080035575
    Abstract: This invention relates to a polymeric membrane composition comprising an associating polymer. The polymer coating is characterized as having hard and soft segments where the hard segment comprises TMPA, combined with HDPA. The membrane may utilize a porous substrate.
    Type: Application
    Filed: August 7, 2007
    Publication date: February 14, 2008
    Inventors: Randall D. Partridge, Dennis G. Peiffer, David C. Dalrymple, Walter Weissman
  • Publication number: 20080035571
    Abstract: This invention relates to the composition of an integrally-layered polymeric membrane and a process for utilizing the integrally-layered polymeric membrane components of a feedstream. More particularly, but not by way of limitation, this invention relates to the composition of an integrally-layered polymeric membrane and a process for utilizing the integrally-layered polymeric membrane in the separation of aromatics from a hydrocarbon based feedstream. The polymeric membranes of the present invention are fabricated by chemically crosslinking adjacent polymer membrane layers of the same or differing copolymer solutions to produce an integrally-layered polymeric membrane with improved separations properties.
    Type: Application
    Filed: August 3, 2007
    Publication date: February 14, 2008
    Inventors: Craig Y. Sabottke, Bal K. Kaul, Dennis G. Peiffer
  • Publication number: 20080035574
    Abstract: This invention relates to a polymeric membrane assembly which incorporates one or more layers of protective barrier films or protective barrier membrane layers to protect the susceptible polymer membrane from deterioration due to contact with water, oxygen or a combination of both. This invention also relates to a process for utilizing these polymeric membrane assemblies in separation processes involving hydrocarbon feedstreams. More particularly, but not by way of limitation, this invention relates to the use of these polymeric membrane assemblies in processes involving the separation of aromatics from a hydrocarbon based feedstream.
    Type: Application
    Filed: August 3, 2007
    Publication date: February 14, 2008
    Inventors: Craig Y. Sabottke, Bal K. Kaul, Dennis G. Peiffer
  • Publication number: 20080035572
    Abstract: This invention relates to the fabrication of a polymeric membrane and a process for utilizing the polymeric membrane for separating components of a feedstream. More particularly, but not by way of limitation, this invention relates to the fabrication of a polymeric membrane and a process for utilizing the polymeric membrane in the separation of aromatics from a hydrocarbon based feedstream. The membranes of the present invention possess low soft segment glass transition temperatures and improved separation characteristics.
    Type: Application
    Filed: August 3, 2007
    Publication date: February 14, 2008
    Inventors: Craig Y. Sabottke, Bal K. Kaul, Dennis G. Peiffer
  • Publication number: 20080035573
    Abstract: This invention relates to a polymeric membrane composition utilizing the non-hazardous compound 4-aminophenyl disulfide (“APD”), a method of making the polymeric membrane, and a process for separating components of a feedstream utilizing the polymeric membrane. More particularly, but not by way of limitation, this invention relates to utilizing the polymeric membrane composition in a process for the separation of aromatics from a hydrocarbon feedstream containing aromatics and aliphatic compounds.
    Type: Application
    Filed: August 3, 2007
    Publication date: February 14, 2008
    Inventors: Dennis G. Peiffer, Randall D. Partridge, Walter Weissman, David C. Dalrymple, Craig Y. Sabottke
  • Publication number: 20080035566
    Abstract: This invention relates to a polymer membrane assembly for selective separation of permeate compositions by carbon weight. This invention also relates to a process for utilizing these polymer membrane assemblies in separation processes for selective carbon weight separation of hydrocarbon feedstreams components. More particularly, but not by way of limitation, this invention relates to the use membrane assemblies for the selective separation by carbon weight of aromatics from a hydrocarbon based feedstream.
    Type: Application
    Filed: August 3, 2007
    Publication date: February 14, 2008
    Inventors: Craig Y. Sabottke, Bal K. Kaul, Dennis G. Peiffer
  • Patent number: 7186673
    Abstract: A method for enhancing the stability of a water-in-oil emulsion pretreating at least a portion of the oil prior to emulsification. The pretreatment step may consist of adding polymers to the oil, biotreating the oil, photochemically treating the oil, or combinations thereof. The emulsion may be used in various enhanced oil recovery methods including using the emulsion as a flooding agent to displace hydrocarbons in a subterranean formation, and using the emulsion as a barrier fluid for diverting flow of fluids in the formation.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: March 6, 2007
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Ramesh Varadaraj, James R. Bragg, Dennis G. Peiffer, Chester W. Elspass
  • Publication number: 20040222157
    Abstract: A method for recovering acid from a feed mixture comprising acid, hydrocarbons and water, the method comprising:
    Type: Application
    Filed: February 6, 2004
    Publication date: November 11, 2004
    Inventors: Bhupender S. Minhas, Dennis G. Peiffer, Jorge L. Soto, David L. Stern, Tomas R. Melli, Jeffrey S. Beck, Steven Ackerman, David C. Dalrymple, Alexander D.S. Fremuth, Walter Weissman, Frederick J. Krambeck
  • Publication number: 20040122111
    Abstract: A method for enhancing the stability of a water-in-oil emulsion pretreating at least a portion of the oil prior to emulsification. The pretreatment step may consist of adding polymers to the oil, biotreating the oil, photochemically treating the oil, or combinations thereof. The emulsion may be used in various enhanced oil recovery methods including using the emulsion as a flooding agent to displace hydrocarbons in a subterranean formation, and using the emulsion as a barrier fluid for diverting flow of fluids in the formation.
    Type: Application
    Filed: March 28, 2001
    Publication date: June 24, 2004
    Inventors: Ramesh Varadaraj, James R. Bragg, Dennis G. Peiffer, Chester W. Elspass
  • Patent number: 6734144
    Abstract: A method for enhancing the stability of a solids-stabilized water-in-oil emulsion by pretreating the oil prior to emulsification. The pretreatment step can be accomplished by adding dilute acid to the oil, adding a lignosulfonate additive to the oil, sulfonating the oil, thermally oxidizing the oil, thermally treating the oil in an inert environment, and combinations thereof. The emulsion can be used in enhanced oil recovery methods, including using the emulsion as a drive fluid to displace hydrocarbons in a subterranean formation, and using the emulsion as a barrier fluid for diverting flow of fluids in the formation.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: May 11, 2004
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Ramesh Varadaraj, James R. Bragg, Monte K. Dobson, Dennis G. Peiffer, John S. Huang, Donald B. Siano, Cornelius H. Brons, Chester W. Elspass
  • Publication number: 20030166811
    Abstract: A copolymer comprising units derivable from (A) one or more olefins of defined chain length; and (B) one or more ethylenically unsaturated compounds different from (A). The copolymers are useful as cold flow improvers in fuel oils.
    Type: Application
    Filed: December 2, 1999
    Publication date: September 4, 2003
    Inventors: DENNIS G. PEIFFER, BRID DILWORTH, ROBERT DRYDEN TACK
  • Patent number: 6508848
    Abstract: A macromolecular cold flow improver in which a crystalline moiety and an oil-solubility enhancing moiety are linked by a functional group.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: January 21, 2003
    Assignee: Infineum International Ltd.
    Inventors: Dennis G. Peiffer, Panagiotis Dounis, Ramah J. Brod, George R. Chludzinski
  • Patent number: 6388018
    Abstract: Graft copolymers having cationic units pendant to the backbone chain are disclosed. These polymers are prepared by reacting a polymer containing halogenated para-methylstyrene units in the chain, e.g., a brominated copolymer of isobutylene and para-methylstyrene, with an anionically polymerized polymer made using an organolithium initiator compound having the formula R1 R2 Z R3—Li where R1 and R2 are alkyl radicals, R3 is a direct link or an organic radical and Z is nitrogen or phosphorous. Reaction of the anionically polymerized polymer having an R1 R2 Z R3— end group with the halogenated polymer leads to graft polymers coupled by a quaternary ammonium or phosphonium groups.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: May 14, 2002
    Assignee: ExxonMobile Research and Engineering Company
    Inventors: Dennis G. Peiffer, Hsien-Chang Wang, Pamela Jean Wright, Joseph A. Sissano, Lewis J. Fetters, Louise M. Wheeler, Rebecca L. Rucker
  • Publication number: 20010049902
    Abstract: A method for enhancing the stability of a solids-stabilized water-in-oil emulsion by pretreating the oil prior to emulsification. The pretreatment step can be accomplished by adding dilute acid to the oil, adding a lignosulfonate additive to the oil, sulfonating the oil, thermally oxidizing the oil, thermally treating the oil in an inert environment, and combinations thereof. The emulsion can be used in enhanced oil recovery methods, including using the emulsion as a drive fluid to displace hydrocarbons in a subterranean formation, and using the emulsion as a barrier fluid for diverting flow of fluids in the formation.
    Type: Application
    Filed: March 28, 2001
    Publication date: December 13, 2001
    Inventors: Ramesh Varadaraj, James R. Bragg, Monte K. Dobson, Dennis G. Peiffer, John S. Huang, Donald B. Siano, Cornelius H. Brons, Chester W. Elspass
  • Patent number: 6297301
    Abstract: Thermoplastic elastomers having improved processability are prepared by incorporating one or more organic sulfate or sulfonate salts into blends of thermoplastic polymers and olefinic rubber and melt processing the mixture. The rubber component of the mixture is preferably at least partially cured.
    Type: Grant
    Filed: October 16, 1997
    Date of Patent: October 2, 2001
    Assignees: ExxonMobil Chemical Patents Inc., Advanced Customer Systems, L.P.
    Inventors: Thomas C. Erderly, James J. Chludzinski, Armen H. Dekmezian, Angelo A. Montagna, Dennis G. Peiffer, Maria D. Ellul, Donald R. Hazelton, Barry M. Rosenbaum