Patents Represented by Attorney David L Hedden

Find this attorney in the Justia Lawyer Directory

  • Stable microemulsion cleaners having low volatile organic content
    Patent number: 5972874
    Abstract: This invention relates to stable microemulsion cleaners having decreased volatile organic content comprising (a) a non polar, organic hydrocarbon solvent system comprising (i) an aromatic solvent and/or (ii) an aliphatic solvent, (b) an ethoxylate of an aromatic or aliphatic hydrophobe; (c) a glycol ether or ethylene glycol; a primary amino alcohol; water; and other components for specific applications. These cleaners can be used for removing oil, grease, and baked-on carbon deposits from metal surfaces, and are particularly useful as engine shampoos and cleaners for air coolers.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: October 26, 1999
    Assignee: Ashland Inc.
    Inventors: Bruce L. Libutti, Joseph Mihelic
  • Consumable pattern coating for lost foam castings
    Patent number: 5950702
    Abstract: The coated pattern is formed from a consumable pattern, preferably polystyrene, and is adapted to be decomposed and replaced by molten metal to form a casting. The improved coating is the dried residue of an aqueous coating formed from water, refractory particles, and from between about 25 wt-% and 75 wt-% organic polymer on a non-volatile solids basis (i.e., dry film basis). Lustrous carbon is reduced when casting iron.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: September 14, 1999
    Assignee: Ashland Inc.
    Inventors: Lian Soon Tan, Teresa Ann DeLong, Ruth Ann Bambauer
  • Riser sleeves for custom sizing and firm gripping
    Patent number: 5915450
    Abstract: This invention relates to riser sleeves which contain markings and concentric grooves. The markings are used to as a guide so one can customize the size of the sleeves and the concentric grooves are used to help hold the sleeve in place when it is placed in the mold where it surrounds the riser. The invention also relates to the use of the riser sleeves in the making of metal castings.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: June 29, 1999
    Assignee: Ashland Inc.
    Inventors: Ronald C. Aufderheide, David M. Gilson, John L. Perrins
  • Benzylic ether phenolic resole resins and their uses
    Patent number: 5908914
    Abstract: This invention relates to benzylic ether phenolic resole resins prepared in a sealed reaction vessel and their uses. The benzylic ether phenolic resole resins are prepared by heating phenol and an aldehyde in a sealed reaction vessel in the presence of a divalent metal catalyst without removing water generated by the reaction until an appropriate endpoint for the resin is reached. The benzylic ether phenolic resole resins produced by the process are preferably free or essentially free of unreacted formaldehyde and can be used in the resin component of phenolic-urethane foundry binders to make foundry cores and/or molds by the cold-box and no-bake processes. The cores and/or molds are used for making metal castings.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: June 1, 1999
    Assignee: Ashland Inc.
    Inventors: Thomas Edward Dando, William Rexford Dunnavant, Robert Bernard Fechter, Heimo Josef Langer
  • Modified polymeric aromatic isocyanates having allophanate linkages
    Patent number: 5902840
    Abstract: The invention relates to modified polymeric aromatic isocyanates having allophanate linkages prepared by (a) reacting a polymeric aromatic isocyanate with a monofunctional aliphatic alcohol to form an intermediate modified polymeric isocyanate; and (b) reacting the intermediate modified polymeric isocyanate at an elevated temperature in the presence of a divalent metal catalyst. The invention also relates to foundry binder systems which use these modified polyisocyanates. These modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with a gaseous amine curing catalyst by the cold-box process.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: May 11, 1999
    Assignee: Ashland Inc.
    Inventors: Rina Singh, Laurence G. Dammann
  • Amine cured foundry binder system and their uses
    Patent number: 5880175
    Abstract: The subject invention relates to a foundry binder system which cures in the presence of a volatile amine curing catalyst comprising (a) an epoxy resin,(b) an organic polyisocyanate, (c) a reactive unsaturated acrylic monomer or polymer, and (d) an oxidizing agent. The foundry binders are used for making foundry mixes. The foundry mixes are used to make foundry shapes which are used to make metal castings.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: March 9, 1999
    Assignee: Ashland Inc.
    Inventors: James J. Archibald, Matthew S. Sheridan
  • Amine modified polyisocyanates and their use in foundry binder systems
    Patent number: 5880174
    Abstract: The invention relates to amine modified polyisocyanates having urea linkages and their use in foundry binder systems. The modified polyisocyanates are prepared by reacting a polyisocyanate with an aliphatic primary or secondary amine. These amine modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with an amine curing catalyst.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: March 9, 1999
    Assignee: Ashland Inc.
    Inventors: Rina Singh, Laurence G. Dammann
  • Foundary binder systems which contain alcohol modified polyisocyanates
    Patent number: 5874487
    Abstract: The invention relates to foundry binder systems which use modified polyisocyanates. The modified polyisocyanates are prepared by reacting a polyisocyanate with an aliphatic alcohol having one active hydrogen atom. These modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with a gaseous amine curing catalyst.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: February 23, 1999
    Assignee: Ashland Inc.
    Inventors: Rina Singh, Laurence G. Dammann
  • No-bake foundry mixes and their use
    Patent number: 5859091
    Abstract: This invention relates to polyurethane-forming foundry binder systems and foundry mixes which comprise a foundry aggregate, said foundry binder system, and a liquid amine curing catalyst. The binder system comprises a polyol component containing a polyether polyol and a monomeric glycol, and an organic polyisocyanate component. The foundry mixes are used to prepare foundry shapes made from foundry mixes by a no-bake process.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: January 12, 1999
    Assignee: Ashland Inc.
    Inventors: Chia-hung Chen, Thomas E. Dando
  • Heat curable binder systems and their use
    Patent number: 5837047
    Abstract: This invention relates to heat cured binder systems comprising as separate Parts: Part I comprising (a) a soluble source of silica, (b) an alcohol, and preferably (c) a surfactant; and Part II comprising an alkali aluminate. The binder systems are mixed with a refractory to form a refractory mix. The resulting refractory mix is shaped and heated at an elevated temperature to form a cured refractory shape, particularly a preform. Heat is applied by warm air, baking in an oven, microwave, or preferably by hot-box equipment.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: November 17, 1998
    Assignee: Ashland Inc.
    Inventors: Helena Twardowska, John J. Cooper
  • Process for preparing benzylic ether phenolic resole resins
    Patent number: 5756640
    Abstract: This invention relates to a process for preparing benzylic ether phenolic resole resins in a sealed reaction vessel. The benzylic ether phenolic resole resins are prepared by heating phenol and an aldehyde in a sealed reaction vessel in the presence of a divalent metal catalyst without removing water generated by the reaction until an appropriate endpoint for the resin is reached. The benzylic ether phenolic resole resins produced by the process are preferably free or essentially free of unreacted formaldehyde and can be used in the resin component of phenolic-urethane foundry binders to make foundry cores and/or molds by the cold-box and no-bake processes. The cores and/or molds are used for making metal castings.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: May 26, 1998
    Assignee: Ashland Inc.
    Inventors: Thomas Edward Dando, William Rexford Dunnavant, Robert Bernard Fechter, Heimo Josef Langer
  • Process for controlling the deposition of pitch with a blend of derivatized cationic guar and styrene maleic anhydride copolymer
    Patent number: 5744003
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) styrene maleic anhydride copolymer.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: April 28, 1998
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Heat curable alumino-silicate binder systems and their use
    Patent number: 5743953
    Abstract: This invention relates to heat curable alumino-silicate binder systems comprising as three separate parts (1) a soluble source of silica, (2) a caustic solution of an alkali silicate, and (3) aluminum silicate, and an alcohol which may be incorporated into (1), (2), or both. The binder systems are mixed with an aggregate to form a mix. The resulting mix is shaped and heated at an elevated temperature to form a cured shape, particularly foundry cores and molds. Heat is applied by warm air, baking in an oven, microwave, or preferably by hot-box equipment.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: April 28, 1998
    Assignee: Ashland Inc.
    Inventors: Helena Twardowska, John J. Cooper, Yuliy Yunovich
  • Benzylic ether phenolic resole resins
    Patent number: 5739255
    Abstract: This invention relates to benzylic ether phenolic resole resins prepared in a sealed reaction vessel. The benzylic ether phenolic resole resins are prepared by heating phenol and an aldehyde in a sealed reaction vessel in the presence of a divalent metal catalyst without removing water generated by the reaction until an appropriate endpoint for the resin is reached. The benzylic ether phenolic resole resins produced by the process are preferably free or essentially free of unreacted formaldehyde and can be used in the resin component of phenolic-urethane foundry binders to make foundry cores and/or molds by the cold-box and no-bake processes. The cores and/or molds are used for making metal castings.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: April 14, 1998
    Assignee: Ashland Inc.
    Inventors: Thomas Edward Dando, William Rexford Dunnavant, Robert Bernard Fechter, Heimo Josef Langer
  • Microemulsion cleaners having decreased odor
    Patent number: 5723430
    Abstract: This invention relates to microemulsion cleaners having decreased odor comprising (a) an organic solvent (b) a nonionic surfactant blend (c) a glycol ether (d) a phosphate ester hydrotrope or salt thereof (e) primary amino alcohol, and (f) water. These cleaners can be used for removing baked-on oil and carbon deposits.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: March 3, 1998
    Assignee: Ashland Inc.
    Inventor: Joseph Mihelic
  • Pitch control composition
    Patent number: 5702644
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in acid pulp and paper making operations comprising a derivatized cationic guar and an alkali metal polyacrylate dispersant. The invention also relates to a process for inhibiting pitch deposition on paper making equipment.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: December 30, 1997
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Polyurethane-forming cold-box binders and their uses
    Patent number: 5688857
    Abstract: This invention relates to polyurethane-forming cold-box binders and foundry mixes prepared with these binders. The binder comprises a polyol component and an organic polyisocyanate component. Foundry mixes are prepared by mixing the binder with a foundry aggregate. Foundry shapes (molds and cores) are prepared by shaping the mix and curing the foundry shape with a gaseous tertiary amine curing catalyst.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: November 18, 1997
    Assignee: Ashland Inc.
    Inventors: Chia-hung Chen, James T. Schneider
  • Water-based soft coating for metals
    Patent number: 5660890
    Abstract: This invention relates to a water-based coating comprising as separate components (A) a grind component comprising in admixture (1) a water compatible overbased alkaline earth alkyl-aryl sulfonate; (2) an organic amine; and (3) an inorganic borate corrosion inhibitor; and (B) a liquid component comprising (1) water; (2) an acrylic emulsion; (3) an organic amine. The coatings are particularly useful for coating ferrous metal surfaces.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: August 26, 1997
    Assignee: Ashland Inc.
    Inventors: Rosanna Pall Rudy, Andrew Anthony Romano
  • Stabilization of heavy metals in ash
    Patent number: 5649895
    Abstract: This invention relates to a process for stabilizing heavy metals in ash. The steps of the process include: (a) preparing an aqueous slurry of ash and water; (b) decreasing the pH of the aqueous slurry to less than about 5.0 in the presence of an iron salt; (c) treating the aqueous slurry with (1) an organo sulfur containing compound, (2) an alkaline extract of peat moss, and (3) an alkaline earth metal containing compound. Heavy metals in ash treated by this process will not leach into the environment.
    Type: Grant
    Filed: February 14, 1996
    Date of Patent: July 22, 1997
    Assignee: Ashland Inc.
    Inventors: Kathleen Ann Fix, Mark Gerard Kramer
  • Riser sleeve
    Patent number: D397702
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: September 1, 1998
    Inventors: Ronald C. Aufderheide, David M. Gilson, John L. Perrins