Patents by Inventor David C. Dalrymple

David C. Dalrymple 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: 8715545
    Abstract: The present systems and methods utilize a polyamic acid solution as a precursor to form a polyimide bead having desired properties. The polyamic acid solution may be formed into a polyamic acid droplet. The polyamic acid droplet is then processed to form a polyamic acid bead, such as by extraction of solvent to concentrate the polyamic acid or by partial chemical imidization of the polyamic acid. The polyamic acid bead is then better able to retain its shape during subsequent processing steps, such as drying and pressurizing, before final thermal imidization.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: May 6, 2014
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Dennis G. Peiffer, Barbara Carstensen, Richard S. Polizzotti, Arnold Lustiger, David C. Dalrymple, Walter T. Matuszek
  • Publication number: 20120231979
    Abstract: The present systems and methods utilize a polyamic acid solution as a precursor to form a polyimide bead having desired properties. The polyamic acid solution may be formed into a polyamic acid droplet. The polyamic acid droplet is then processed to form a polyamic acid bead, such as by extraction of solvent to concentrate the polyamic acid or by partial chemical imidization of the polyamic acid. The polyamic acid bead is then better able to retain its shape during subsequent processing steps, such as drying and pressurizing, before final thermal imidization.
    Type: Application
    Filed: September 3, 2010
    Publication date: September 13, 2012
    Inventors: Dennis G. Peiffer, Barbara Carstensen, Richard S. Polizzotti, Paul J. Tindall, David C. Dalrymple
  • Publication number: 20120223450
    Abstract: The present systems and methods utilize a polyamic acid solution as a precursor to form a polyimide bead having desired properties. The polyamic acid solution may be formed into a polyamic acid droplet. The polyamic acid droplet is then processed to form a polyamic acid bead, such as by extraction of solvent to concentrate the polyamic acid or by partial chemical imidization of the polyamic acid. The polyamic acid bead is then better able to retain its shape during subsequent processing steps, such as drying and pressurizing, before final thermal imidization.
    Type: Application
    Filed: September 3, 2010
    Publication date: September 6, 2012
    Inventors: Dennis G. Peiffer, Barbara Carstensen, Richard S. Polizzotti, Arnold Lustiger, David C. Dalrymple, Walter T. Matuszek
  • Publication number: 20120225799
    Abstract: The present systems and methods utilize a polyamic acid solution as a precursor to form a polyimide bead having desired properties. The polyamic acid solution may be formed into a polyamic acid droplet. The polyamic acid droplet is then processed to form a polyamic acid bead, such as by extraction of solvent to concentrate the polyamic acid or by partial chemical imidization of the polyamic acid. The polyamic acid bead is then better able to retain its shape during subsequent processing steps, such as drying and pressurizing, before final thermal imidization.
    Type: Application
    Filed: September 3, 2010
    Publication date: September 6, 2012
    Inventors: Dennis G. Peiffer, Barbara Carstensen, Richard S. Polizzotti, Paul J. Tindall, David C. Dalrymple
  • Patent number: 7842124
    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: Grant
    Filed: August 7, 2007
    Date of Patent: November 30, 2010
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Randall D. Partridge, Dennis G. Peiffer, David C. Dalrymple, Walter Weissman
  • Patent number: 7837880
    Abstract: A crosslinked polymeric membrane, such as a crosslinked polyvinyl sulfate membrane or a crosslinked copolymer polyvinyl sulfate and polyvinyl alcohol membrane, is provided. The membrane is suitable for use in an acid environment, and is suitable for recovering acid from a feed mixture comprising acid, hydrocarbons and water.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: November 23, 2010
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Bhupender S. Minhas, Dennis G. Peiffer, David C. Dalrymple
  • Publication number: 20100108605
    Abstract: The present invention relates to a polymeric aromatic selective membrane comprising an cross linked polyether imide membrane that comprise the reaction of a polyether amine with an dianhydride, and that may be utilized in a process for selectively separating aromatics from a hydrocarbon feedstream comprised of aromatic and aliphatic hydrocarbons and at least one alcohol, typically ethanol.
    Type: Application
    Filed: October 27, 2009
    Publication date: May 6, 2010
    Inventors: Abhimanyu O. Patil, Timothy D. Shaffer, Satish Bodige, David C. Dalrymple, Benjamin A. McCool, Randall D. Partridge
  • 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
  • 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: 20080035557
    Abstract: A membrane composition comprising an inorganic substrate which has a coating of an associating polymer. The membrane composition includes an inorganic substrate selected from the group consisting of a porous silica hollow tube, an alumina hollow tube and a ceramic monolith.
    Type: Application
    Filed: August 7, 2007
    Publication date: February 14, 2008
    Inventors: Randall D. Partridge, Dennis G. Pefiffer, David C. Dalrymple, Walter Weissman
  • 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: 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: 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
  • Patent number: 6251305
    Abstract: The present invention relates to a process for reducing the acidity of a petroleum oil containing organic acids comprising treating said petroleum oil containing organic acids with an effective amount of an alcohol at a temperature and under conditions sufficient to form the corresponding ester of said alcohol.
    Type: Grant
    Filed: October 6, 1998
    Date of Patent: June 26, 2001
    Assignee: Exxon Research and Engineering Company
    Inventors: Guido Sartori, David W. Savage, David C. Dalrymple, Bruce H. Ballinger, Saul C. Blum, William E. Wales
  • Patent number: 5948238
    Abstract: The present invention relates to a process for reducing the acidity of a petroleum oil containing organic acids comprising treating said petroleum oil containing organic acids with an effective amount of an alcohol at a temperature and under conditions sufficient to form the corresponding ester of said alcohol and wherein said treatment is conducted in the presence of a metal carboxylate.
    Type: Grant
    Filed: October 6, 1998
    Date of Patent: September 7, 1999
    Assignee: Exxon Research And Engineering Co.
    Inventors: Guido Sartori, David W. Savage, Saul C. Blum, David C. Dalrymple, William E. Wales
  • Patent number: 5756643
    Abstract: A new copolymer composition comprises the hard segment of a polyimide and the soft segment of an oligomeric aliphatic polycarbonate or a mixture of an oligomeric aliphatic polycarbonate and an oligomeric aliphatic polyester. The new polyimide copolymer membranes have exhibited high selectivity and flux for separation of an aromatic/saturate mixture.
    Type: Grant
    Filed: May 7, 1996
    Date of Patent: May 26, 1998
    Assignee: Exxon Research and Engineering Company
    Inventors: W. S. Winston Ho, Guido Sartori, Warren A. Thaler, David C. Dalrymple
  • Patent number: 5670052
    Abstract: A copolymer composition comprising the hard segment of a polyimide, the soft segment of an oligomeric aliphatic polyester, and a diepoxide for crosslinking and esterification. The diepoxide polyimide copolymer membranes have exhibited high selectivity and flux for separation of an aromatic/saturate mixture. These membranes have shown much better stability in soaking with an aromatic/saturate feed than the copolymer membranes without a diepoxide.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: September 23, 1997
    Assignee: Exxon Research & Engineering Company
    Inventors: Win-Sow Winston Ho, Guido Sartori, Warren A. Thaler, David C. Dalrymple
  • Patent number: 5550199
    Abstract: A new copolymer composition comprising the hard segment of a polyimide, the soft segment of an oligomeric aliphatic polyester, and a diepoxide for crosslinking and esterification. The new diepoxide polyimide copolymer membranes have exhibited high selectivity and flux for separation of an aromatic/saturate mixture. These new membranes have shown much better stability in soaking with an aromatic/saturate feed than the copolymer membranes without a diepoxide.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: August 27, 1996
    Assignee: Exxon Research and Engineering Company
    Inventors: Win-Sow W. Ho, Guido Sartori, Warren A. Thaler, David C. Dalrymple
  • Patent number: 5093003
    Abstract: A new copolymer composition comprising the soft segment of an aliphatic polyester and the hard segment of a highly halogenated polyurethane containing from 3 to 36 halogen atoms is disclosed. The new halogenated polyurethane copolymer membrane has high thermal stability, and good selectivity and permeability for separation of an aromatic/saturate mixture.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: March 3, 1992
    Assignee: Exxon Research and Engineering Company
    Inventors: W. S. Winston Ho, Guido Sartori, Warren A. Thaler, Bruce H. Ballinger, David C. Dalrymple, Robert P. Mastondrea
  • Patent number: 5028685
    Abstract: A new copolymer composition comprising the soft segment of an aliphatic polyester and the hard segment of a highly halogenated polyurethane containing from 3 to 36 halogen atoms is disclosed. The new halogenated polyurethane copolymer membrane has high thermal stability, and good selectivity and permeability for separation of an aromatic/saturate mixture.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: July 2, 1991
    Assignee: Exxon Research & Engineering Company
    Inventors: W. S. Winston Ho, Guido Sartori, Warren A. Thaler, Bruce H. Ballinger, David C. Dalrymple, Robert P. Mastondrea