Patents by Inventor Douglas Kip Hillshafer

Douglas Kip Hillshafer 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).

  • Publication number: 20240141225
    Abstract: A hydraulic fracturing method for recovering oil from a low-temperature subterranean oil formation is disclosed. Before, during, or after inducing hydraulic fracturing within the formation, a particulate, degradable polyester diverting agent is introduced into the formation in an amount effective to improve oil production from the formation. The diverting agent is allowed to degrade, and oil is recovered. The diverting agent has a melting point greater than the average temperature of the formation and is selected from: (i) ethylene glycol succinates; (ii) acid-terminated ethylene glycol succinates; (iii) acid-terminated polyglycolic acids; (iv) acid-terminated polylactic acids; and (v) mixtures of any of (i) through (iv) with a half acid ester.
    Type: Application
    Filed: December 27, 2023
    Publication date: May 2, 2024
    Inventors: Douglas Kip Hillshafer, Sarah Wolek
  • Patent number: 11898096
    Abstract: A hydraulic fracturing method for recovering oil from a low-temperature subterranean oil formation is disclosed. Before, during, or after inducing hydraulic fracturing within the formation, a particulate, degradable polyester diverting agent is introduced into the formation in an amount effective to improve oil production from the formation. The diverting agent is allowed to degrade, and oil is recovered. The diverting agent has a melting point greater than the average temperature of the formation and is selected from: (i) ethylene glycol succinates; (ii) acid-terminated ethylene glycol succinates; (iii) acid-terminated polyglycolic acids; (iv) acid-terminated polylactic acids; (v) mixtures of any of (i) through (iv) with a half acid ester; and (vi) mixtures of polylactic acids or polyglycolic acids with a half acid ester.
    Type: Grant
    Filed: June 15, 2020
    Date of Patent: February 13, 2024
    Assignee: Stepan Company
    Inventors: Douglas Kip Hillshafer, Sarah Wolek
  • Publication number: 20220251441
    Abstract: A hydraulic fracturing method for recovering oil from a low-temperature subterranean oil formation is disclosed. Before, during, or after inducing hydraulic fracturing within the formation, a particulate, degradable polyester diverting agent is introduced into the formation in an amount effective to improve oil production from the formation. The diverting agent is allowed to degrade, and oil is recovered. The diverting agent has a melting point greater than the average temperature of the formation and is selected from: (i) ethylene glycol succinates; (ii) acid-terminated ethylene glycol succinates; (iii) acid-terminated polyglycolic acids; (iv) acid-terminated polylactic acids; (v) mixtures of any of (i) through (iv) with a half acid ester; and (vi) mixtures of polylactic acids or polyglycolic acids with a half acid ester.
    Type: Application
    Filed: June 15, 2020
    Publication date: August 11, 2022
    Inventors: Douglas Kip HILLSHAFER, Sarah WOLEK
  • Patent number: 9284518
    Abstract: Hydrophilic, multi-arm urethane polymers are described that are dispersible and/or soluble in water, and provide wetting, foaming and cleaning benefits for aqueous cleaning products, including hard surface cleaners, machine dishwash, and liquid hand dishwash compositions.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: March 15, 2016
    Assignee: STEPAN COMPANY
    Inventors: Ronald Anthony Masters, Douglas Kip Hillshafer, Christopher A. Gariepy
  • Publication number: 20140038874
    Abstract: Hydrophilic, multi-arm urethane polymers are described that are dispersible and/or soluble in water, and provide wetting, foaming and cleaning benefits for aqueous cleaning products, including hard surface cleaners, machine dishwash, and liquid hand dishwash compositions.
    Type: Application
    Filed: October 4, 2013
    Publication date: February 6, 2014
    Inventors: Ronald Anthony Masters, Douglas Kip Hillshafer, Christopher A. Gariepy
  • Publication number: 20080269367
    Abstract: The present technology provides at least one prepolymer comprising a polyisocyanate and a ring-containing isocyanate reactive component as a load-bearing capacity improvement agent in flexible polyurethane foam manufacture. The ring-containing component eliminates and/or reduces the need for a copolymer polyol containing suspended solids in the manufacture of flexible foam products. This can reduce production costs, reactivity variations, filter plugging, color variations, foam shrinkage/tightness, foam irregularity, and foam malodor while maintaining an adequate load-bearing capacity.
    Type: Application
    Filed: October 17, 2006
    Publication date: October 30, 2008
    Inventors: Paul L. Neill, Warren A. Kaplan, Douglas Kip Hillshafer
  • Publication number: 20040259967
    Abstract: The present invention provides a ring-containing component polyol and process for making the same for use as a load-bearing capacity improvement agent in flexible polyurethane foam manufacture. The ring-containing component polyol eliminates and/or reduces the need for a copolymer polyol containing suspended solids in the manufacture of flexible foam products. This may reduce production costs, reactivity variations, filter plugging, color variations, foam shrinkage/tightness, foam irregularity, and foam malodor while maintaining an adequate load-bearing capacity. The present polyol blends can be non-opaque or transparent.
    Type: Application
    Filed: April 23, 2004
    Publication date: December 23, 2004
    Inventors: Paul L. Neill, Ronald M. Herrington, James E. Stogis, Rick L. Tabor, Warren A. Kaplan, Douglas Kip Hillshafer, James D. Hoesly