Patents by Inventor Anthony G. Schaefer

Anthony G. Schaefer 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: 11834553
    Abstract: Among other aspects, provided herein is a mixed-acid salt of a water-soluble polymer-drug conjugate, along with related methods of making and using the same. The mixed-salt acid salt is stably formed, and appears to be more resistant to hydrolytic degradation than the corresponding predominantly pure acid salt or free base forms of the polymer-drug conjugate. The mixed acid salt is reproducibly prepared and recovered, and provides surprising advantages over non-mixed acid salt forms of the water-soluble polymer drug conjugate.
    Type: Grant
    Filed: October 2, 2020
    Date of Patent: December 5, 2023
    Assignee: Nektar Therapeutics
    Inventors: Antoni Kozlowski, Samuel P. McManus, Sachin Tipnis, Greg Lavaty, David Swallow, John R. Handley, Anthony G. Schaefer
  • Publication number: 20210024693
    Abstract: Among other aspects, provided herein is a mixed-acid salt of a water-soluble polymer-drug conjugate, along with related methods of making and using the same. The mixed-salt acid salt is stably formed, and appears to be more resistant to hydrolytic degradation than the corresponding predominantly pure acid salt or free base forms of the polymer-drug conjugate. The mixed acid salt is reproducibly prepared and recovered, and provides surprising advantages over non-mixed acid salt forms of the water-soluble polymer drug conjugate.
    Type: Application
    Filed: October 2, 2020
    Publication date: January 28, 2021
    Inventors: Antoni Kozlowski, Samuel P. McManus, Sachin Tipnis, Greg Lavaty, David Swallow, John R. Handley, Anthony G. Schaefer
  • Publication number: 20160200867
    Abstract: Among other aspects, provided herein is a mixed-acid salt of a water-soluble polymer-drug conjugate, along with related methods of making and using the same. The mixed-salt acid salt is stably formed, and appears to be more resistant to hydrolytic degradation than the corresponding predominantly pure acid salt or free base forms of the polymer-drug conjugate. The mixed acid salt is reproducibly prepared and recovered, and provides surprising advantages over non-mixed acid salt forms of the water-soluble polymer drug conjugate.
    Type: Application
    Filed: March 21, 2016
    Publication date: July 14, 2016
    Inventors: Antoni Kozlowski, Samuel P. McManus, Sachin Tipnis, Greg Lavaty, David Swallow, John R. Handley, Anthony G. Schaefer
  • Patent number: 9226969
    Abstract: Among other aspects, provided herein is a hydrohalide salt of a multi-arm water-soluble polyethylene glycol-drug conjugate, along with related methods of making and using the same. The hydrohalide salt is stably formed, and appears to be more resistant to hydrolytic degradation than the corresponding free base form of the conjugate.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: January 5, 2016
    Assignee: Nektar Therapeutics
    Inventors: Anthony O. Chong, Seoju Lee, Bhalchandra V. Joshi, Brian Bray, Shaoyong Nie, Patrick L. Spence, Antoni Kozlowski, Samuel P. McManus, Sachin Tipnis, David Swallow, John R. Handley, Anthony G. Schaefer
  • Publication number: 20150105519
    Abstract: Among other aspects, provided herein is a mixed-acid salt of a water-soluble polymer-drug conjugate, along with related methods of making and using the same. The mixed-salt acid salt is stably formed, and appears to be more resistant to hydrolytic degradation than the corresponding predominantly pure acid salt or free base forms of the polymer-drug conjugate. The mixed acid salt is reproducibly prepared and recovered, and provides surprising advantages over non-mixed acid salt forms of the water-soluble polymer drug conjugate.
    Type: Application
    Filed: May 21, 2014
    Publication date: April 16, 2015
    Applicant: NEKTAR THERAPEUTICS
    Inventors: Anthony O. Chong, Seoju Lee, Bhalchandra V. Joshi, Brian Bray, Shaoyong Nie, Patrick L. Spence, Antoni Kozlowski, Samuel P. McManus, Sachin Tipnis, Greg Lavaty, David Swallow, John R. Handley, Anthony G. Schaefer
  • Publication number: 20130231359
    Abstract: Among other aspects, provided herein is a hydrohalide salt of a multi-arm water-soluble polyethylene glycol-drug conjugate, along with related methods of making and using the same. The hydrohalide salt is stably formed, and appears to be more resistant to hydrolytic degradation than the corresponding free base form of the conjugate.
    Type: Application
    Filed: November 18, 2010
    Publication date: September 5, 2013
    Applicant: Nektar Therapeutics
    Inventors: Anthony O. Chong, Seoju Lee, Bhalchandra V. Joshi, Brian Bray, Shaoyong Nie, Patrick L. Spence, Antoni Kozlowski, Samuel P. McManus, Sachin Tipnis, Greg Lavaty, David Swallow, John R. Handley, Anthony G. Schaefer
  • Publication number: 20130143909
    Abstract: Among other aspects, provided herein is a mixed-acid salt of a water-soluble polymer-drug conjugate, along with related methods of making and using the same. The mixed-salt acid salt is stably formed, and appears to be more resistant to hydrolytic degradation than the corresponding predominantly pure acid salt or free base forms of the polymer-drug conjugate. The mixed acid salt is reproducibly prepared and recovered, and provides surprising advantages over non-mixed acid salt forms of the water-soluble polymer drug conjugate.
    Type: Application
    Filed: November 18, 2010
    Publication date: June 6, 2013
    Applicant: Nektar Therapeutics
    Inventors: Anthony O. Chong, Seoju Lee, Bhalchandra V. Joshi, Brian Bray, Shaoyong Nie, Patrick L. Spence, Antoni Kozlowski, Samuel P. McManus, Sachin Tipnis, Greg Lavaty, David Swallow, John R. Handley, Anthony G. Schaefer
  • Publication number: 20120271000
    Abstract: Methods for preparing conjugates using polymeric reagents bearing a maleimide are provided. Also provided are compositions comprising the conjugates.
    Type: Application
    Filed: June 21, 2012
    Publication date: October 25, 2012
    Applicant: Nektar Therapeutics
    Inventors: Antoni Kozlowski, John Handley, Anthony G. Schaefer, Brian Bray, Ryan Odom, Tony L. Sander
  • Patent number: 8227558
    Abstract: Methods for preparing polymeric reagents bearing a maleimide are provided. Also provided are related compositions.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: July 24, 2012
    Assignee: Nektar Therapeutics
    Inventors: Antoni Kozlowski, John R. Handley, Anthony G. Schaefer, Brian Bray, Ryan Odom, Tony L. Sander
  • Publication number: 20120022220
    Abstract: Methods for preparing polymeric reagents bearing a maleimide are provided. Also provided are related compositions.
    Type: Application
    Filed: October 4, 2011
    Publication date: January 26, 2012
    Applicant: Nektar Therapeutics
    Inventors: Antoni Kozlowski, John Handley, Anthony G. Schaefer, Brian Bray, Ryan Odom, Tony L. Sander
  • Patent number: 8058385
    Abstract: Methods for preparing conjugates using polymeric reagents bearing a maleimide are provided. Also provided are compositions comprising the conjugates.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: November 15, 2011
    Assignee: Nektar Therapeutics
    Inventors: Antoni Kozlowski, John Handley, Anthony G. Schaefer, Brian Bray, Ryan Odom, Tony L. Sander
  • Publication number: 20110046315
    Abstract: Methods for preparing conjugates using polymeric reagents bearing a maleimide are provided. Also provided are compositions comprising the conjugates.
    Type: Application
    Filed: November 4, 2010
    Publication date: February 24, 2011
    Applicant: Nektar Therapeutics
    Inventors: Antoni Kozlowski, John Handley, Anthony G. Schaefer, Brian Bray, Ryan Odom, Tony L. Sander
  • Patent number: 7872082
    Abstract: Methods for preparing polymeric reagents bearing a maleimide are provided. Also provided are compositions comprising the polymeric reagents, and conjugates prepared by polymeric reagents obtained by the described methods.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: January 18, 2011
    Assignee: Nektar Therapeutics
    Inventors: Antoni Kozlowski, John Handley, Anthony G. Schaefer, Brian Bray, Ryan Odom, Tony L. Sander
  • Patent number: 6638459
    Abstract: A method for preparing compression molded or pressed lignocellulosic articles is disclosed. The method involves forming a binder resin by combining a polyisocyanate component with a parting agent and preferably a synergist. The parting agent is the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure R—(ao)n—Y where: R is a hydrophobic group containing alkyl, alkaryl, polyaryl, or siloxane moieties; (ao) is an alkylene oxide or mixture of alkylene oxides; n is from 1 to 25; and Y represents a monofunctional isocyanate-reactive group. A resinated lignocellulosic mixture is formed by combining the binder resin with lignocellulosic particles. Then a compression molded or pressed lignocellulosic article is formed by compressing the resinated lignocellulosic mixture at an elevated temperature and under pressure.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: October 28, 2003
    Assignee: BASF Corporation
    Inventors: Donald C. Mente, Li-Mei Lu, David D. Peters, Joe C. Wilson, Anthony G. Schaefer
  • Publication number: 20030047278
    Abstract: A method for preparing compression molded or pressed lignocellulosic articles is disclosed. The method involves forming a binder resin by combining a polyisocyanate component with a parting agent and preferably a synergist. The parting agent is the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure R—(ao)n—Y where: R is a hydrophobic group containing alkyl, alkaryl, polyaryl, or siloxane moieties; (ao) is an alkylene oxide or mixture of alkylene oxides; n is from 1 to 25; and Y represents a monofunctional isocyanate-reactive group. A resinated lignocellulosic mixture is formed by combining the binder resin with lignocellulosic particles. Then a compression molded or pressed lignocellulosic article is formed by compressing the resinated lignocellulosic mixture at an elevated temperature and under pressure.
    Type: Application
    Filed: August 20, 2002
    Publication date: March 13, 2003
    Applicant: BASF Corporation
    Inventors: Donald C. Mente, Li-Mei Lu, David D. Peters, Joe C. Wilson, Anthony G. Schaefer
  • Patent number: 6464820
    Abstract: A method for preparing compression molded or pressed lignocellulosic articles is disclosed. The method involves forming a binder resin by combining a polyisocyanate component with a parting agent and preferably a synergist. The parting agent is the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure R—(ao)n—Y where: R is a hydrophobic group containing alkyl, alkaryl, polyaryl, or siloxane moieties; (ao) is an alkylene oxide or mixture of alkylene oxides; n is from 1 to 25; and Y represents a monofunctional isocyanate-reactive group. A resinated lignocellulosic mixture is formed by combining the binder resin with lignocellulosic particles. Then a compression molded or pressed lignocellulosic article is formed by compressing the resinated lignocellulosic mixture at an elevated temperature and under pressure.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: October 15, 2002
    Assignee: BASF Corporation
    Inventors: Donald C. Mente, Li-Mei Lu, David D. Peters, Joe C. Wilson, Anthony G. Schaefer
  • Patent number: 6451101
    Abstract: There is disclosed a parting agent comprising the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure R-(ao)n-Y wherein: R is a hydrophobic group containing alkyl, alkaryl, polyaryl, or siloxane moieties; (ao) is an alkylene oxide or mixture of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, and mixtures thereof; n is about 1 to about 25; and Y represents a monofunctional isocyanate-reactive group. There is also disclosed the processes that may be utilized to produce the parting agent.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: September 17, 2002
    Assignee: BASF Corporation
    Inventors: Donald C. Mente, Li-Mei Lu, David D. Peters, Joe C. Wilson, Anthony G. Schaefer
  • Publication number: 20020123641
    Abstract: There is disclosed a parting agent comprising the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure
    Type: Application
    Filed: December 29, 2000
    Publication date: September 5, 2002
    Inventors: Donald C. Mente, Li-Mei Lu, David D. Peters, Joe C. Wilson, Anthony G. Schaefer
  • Publication number: 20020121327
    Abstract: A method for preparing compression molded or pressed lignocellulosic articles is disclosed. The method involves forming a binder resin by combining a polyisocyanate component with a parting agent and preferably a synergist. The parting agent is the reaction product of an isocyanate compound and an isocyanate-reactive compound of the general structure R—(ao)n—Y where: R is a hydrophobic group containing alkyl, alkaryl, polyaryl, or siloxane moieties; (ao) is an alkylene oxide or mixture of alkylene oxides; n is from 1 to 25; and Y represents a monofunctional isocyanate-reactive group. A resinated lignocellulosic mixture is formed by combining the binder resin with lignocellulosic particles. Then a compression molded or pressed lignocellulosic article is formed by compressing the resinated lignocellulosic mixture at an elevated temperature and under pressure.
    Type: Application
    Filed: December 29, 2000
    Publication date: September 5, 2002
    Inventors: Donald C. Mente, Li-Mei Lu, David D. Peters, Joe C. Wilson, Anthony G. Schaefer
  • Patent number: 6346558
    Abstract: A polyester polyol composition comprising a phthalic anhydride-initiated polyester polyol, a C4-C6 hydrocarbon blowing agent, and an alkylene oxide modified silicone glycol compatibilizing agent having an HLB of from about 5 to about 8 is disclosed. The blowing agent is soluble in the polyol composition, thereby reducing the risks associated with such blowing agents in processes for making rigid polymer foam articles and providing rigid foams having good dimensional stability and improved insulation properties. An alkylene oxide and isocyanate modified silicone glycol compatibilizing agent is also disclosed.
    Type: Grant
    Filed: August 7, 2001
    Date of Patent: February 12, 2002
    Assignee: BASF Corporation
    Inventors: David D. Peters, Robert E. Riley, Jimmy L. Patterson, Anthony G. Schaefer