Patents Examined by John Kight, III
  • Biodegradable copolymer from hydroxy proline
    Patent number: 5395916
    Abstract: A biodegradable copolymer having the constituent units represented by the structures (I) and (II): ##STR1## wherein X represents a hydrogen atom, an acyl group having the formula RCO-- where R is a hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group having to 20 carbon atoms, and Y represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and m and n are independently integers of 1 or more, m+n is at least 10, and m/(m+n) is at least 0.01 and a pharmaceutical composition containing the same.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: March 7, 1995
    Assignee: Teijin Limited
    Inventors: Seiji Mochizuki, Kiyoshi Nawata, Yuji Makino, Yoshiki Suzuki
  • Chemical degradation of cured amino resins
    Patent number: 5393828
    Abstract: A process for chemically degrading cured amino resins comprises reacting cured amino resins, which may contain fillers, with a primary and/or secondary amine at from 40.degree. to 250.degree. C.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: February 28, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Juergen Weiser, Wolfgang Reuther, Erwin Hahn
  • Process for coagulation and washing of polybenzazole fibers
    Patent number: 5393478
    Abstract: Fibers spun from polybenzazole dopes can quickly be washed to remove polyphosphoric acid by a combination of initially washing with an acidic liquid and second washing with a hot leaching fluid at at least about 60. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: February 28, 1995
    Assignee: The Dow Chemical Company
    Inventors: Ashish Sen, Katsuya Tani, Kazunori Katoh
  • Sheetlike wholly aromatic polyamide shaped article and a method for producing the same
    Patent number: 5393872
    Abstract: This invention relates to a sheetlike wholly aromatic polyamide shaped article useful as electrical insulating materials excellent in corona resistance (corona durability) and in surface smoothness. The corona durability of said sheetlike shaped article is increased to 150 minutes or above by adding a nonionic polymer flocculant to an aqueous dispersion comprising 10 to 90% by weight of mica particles, preferably treated with a silane coupling agent and 90 to 10% by weight of a wholly aromatic polyamide stock (fibrids and fibers) in obtaining the sheetlike shaped article from the aqueous dispersion by wet shaping.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: February 28, 1995
    Assignee: Teijin Limited
    Inventors: Takanori Shinoki, Akio Nakaishi, Michio Yamamoto
  • Epoxide system curing agents
    Patent number: 5393806
    Abstract: An improved liquid matrix system for producing fibre-reinforced plastic components is disclosed. The system comprises (i) a liquid diglycidyl ether of a halogenated bisphenol or a mixture of liquid polyglycidyl ether bisphenols at least one of which being a polyglycidyl ether halogenated bisphenol; and (ii) a curing agent that is a sterically hindered aromatic diamine containing two primary amino groups attached to the carbon atoms in the aromatic nucleus, said carbon atoms not adjacent to each other, and at least one C.sub.1 to C.sub.6 linear or branched alkyl or thioalkyl substituent; the improvement comprising adding to said system a curing accelerator composition containing a mixture of a boron halide and an imidazole unsubstituted or substituted with at least one C.sub.1 to C.sub.6 linear or branched alkyl or C.sub.6 to C.sub.10 aryl.
    Type: Grant
    Filed: December 26, 1991
    Date of Patent: February 28, 1995
    Assignee: Albemarle Corporation
    Inventor: Farah D. Azarnia
  • Method for the production of polytetramethylene ether glycol
    Patent number: 5393866
    Abstract: A method for the production of polytetramethylene ether glycol wherein polymerization of tetrahydrofuran in the presence of fluorosulfonic acid is followed by hydrolysis of the resulting polymer, characterized by(1) using the fluorosulfonic acid at 0.007-0.3 molar equivalents with respect to the tetrahydrofuran;(2) using in combination therewith fuming sulfuric acid which contains free sulfur trioxide at 0.05-1.0 molar equivalent with respect to the fluorosulfonic acid; and(3) adding said fuming sulfuric acid to the tetrahydrofuran prior to adding the fluorosulfonic acid thereto.According to the method, high quality polytetramethylene ether glycol with a low fluorine content may be obtained at a high yield without lowering the polymerization temperature. For example, PTMG may be obtained with 3 or fewer, and preferably 2 or fewer terminal fluorines per 2,000 termini of the resulting PTMG.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: February 28, 1995
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Nobuyuki Murai, Masayuki Shirato, Hiroshi Takeo, Hidetoshi Tanaka
  • Wet-etchable random polyimide copolymer for multichip module applications
    Patent number: 5393864
    Abstract: A random polyimide copolymer, based on a rigid dianhydride, a rigid diamine and an additional diamine and/or dianhydride containing one or more flexibilizing linkages. Soft-baked coatings of the poly(amic acid) precursor are readily processed using conventional aqueous base developers, such as tetramethylammonium hydroxide. The polyimide and soft-baked coatings are useful as a dielectric layer In multichip module applications or as a stress buffer coating.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: February 28, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John D. Summers
  • Cyclodextrin refining process
    Patent number: 5393880
    Abstract: Cyclodextrin is refined by performing a crystallization step in the presence of a hydrogen bond inhibitor. The hydrogen bond inhibitor includes a base in an amount to adjust the pH of the solution to 8 and above or a non-base such as urea, guanidium hydrochloride and sodium lauryl sulfate in an amount of 0.1% to 2%.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: February 28, 1995
    Assignee: American Maize-Products Company
    Inventors: Wen Shieh, Timothy Dailey, Allan Hedges
  • Polyamide pigment dispersion
    Patent number: 5391703
    Abstract: An improved process for preparing pigmented drawn polyamide fibers is disclosed, the improvement being the improved processability obtained from the use as a carrier polymer for the pigment dispersion of a random copolymer of hexamethlyene diamine, isophthaiic acid and terephthalic acid.
    Type: Grant
    Filed: May 19, 1993
    Date of Patent: February 21, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Perry H. Lin
  • Aromatic polyester and polyester resin composition
    Patent number: 5391689
    Abstract: A novel wholly aromatic polyester capable of forming an anisotropic melt phase is provided. Such polyester has been demonstrated to be capable of forming quality molded articles having a combination of excellent heat resistance and mechanical properties. The resulting polyester further is capable of readily being melt processed while using conventional equipment. Four essential recurring units are present in the polyester of the present invention wherein (I) is derived from 2,6-napthalenedicarboxylic acid and/or 4,4'-biphenyldicarboxylicacid; (II) is derived from another dicarboxylic acid (as defined) such as terephthalic acid; and (III) is derived from aromatic diols (as defined) such as 1,4-dihydroxybenzene and 4,4'-dihydroxybiphenyl; and (IV) is derived from another aromatic diol (as defined), such as 4,4'-dihydroxydiphenyl ether. In a preferred embodiment, an inorganic filler is dispersed therein.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: February 21, 1995
    Assignee: Polyplastics Co., Ltd.
    Inventors: Yukihiko Kageyama, Tatsuya Saito, Keiichi Kanaka, Kenji Hijikata
  • Production of amine functional polymers having improved purity
    Patent number: 5391710
    Abstract: Amine functional polymers are purified to remove formate present by contact with a supported Group VIII metal hydrogen transfer catalyst under conditions favoring formate decomposition to carbon dioxide and hydrogen which are removed as gases. The preferred catalyst is palladium on carbon. Essentially salt-free poly(vinylamines) can be obtained by hydrolysis of polymers of N-vinylformamide in aqueous solution using ammonia or a volatile amine as a hydrolysis agent so that formate salts are the principal by-product of the hydrolysis which creates amine functionality in the polymer. Formate can then by removed by the catalytic decomposition described. Removal of carbon dioxide is enhanced by degassing the hydrolyzate prior to formate decomposition and by nitrogen purge of the polymer solution during the catalytic decomposition reaction.
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: February 21, 1995
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Michael E. Ford
  • Methods of treating colic and founder in horses
    Patent number: 5391372
    Abstract: A method of treatment for the relieving of the symptoms of colic in horses is disclosed which comprises orally administering an effective amount of a pine tea which is prepared by boiling pine needles in water to the horse. Suitable pine needles include Ponderosa pine needles.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: February 21, 1995
    Inventor: Elizabeth Campbell
  • Process for producing a polycarbonate copolymer
    Patent number: 5391693
    Abstract: A polycarbonate copolymer having a desirable heat resistance and impact resistance, and a process for producing the copolymer. The polycarbonate copolymer comprises a carbonate structural unit of the formula (I): ##STR1## wherein A is alkylidene, alkylene, arylene, arylalkylene, --O--, --S--, --SO.sub.2 -- or a single bond, and a carbonate structural unit of formula (II): ##STR2## wherein X.sup.1 and Y.sup.1 are hydrogen, halogen or an organic group and m and n are 1 to 4, wherein the proportion of the carbonate structural unit of the formula (II) being 2 to 15 mole % based on the amount of the carbonate structural unit of the formulas (I) and (II), and the viscosity average molecular weight of the copolymer being 15,000 to 40,000.
    Type: Grant
    Filed: October 1, 1993
    Date of Patent: February 21, 1995
    Assignee: Idemitsu Petrochemical Co., Ltd.
    Inventor: Mitsugu Nakae
  • Printing ink for slightly adherent plastic base, printed matter of said base, and method of printing the base
    Patent number: 5391685
    Abstract: A printing ink for printing slightly adhesive plastic bases, especially polyoxymethylenes and polypropylenes, comprises an ultraviolet-curing ink and an isocyanate compound added thereto. The isocyanate compound is added in an amount of 0.5 to 35 parts by weight per 100 parts by weight of the ultraviolet-curing ink. The invention relates also to printed matter on which given characters, figures, or/and patterns have been printed using such an ultraviolet-curing ink. The invention relates further to a printing method for giving such printed matter. The printing is preceded by a pretreatment selected from among corona discharge, shortwave ultraviolet radiation, and electron radiation.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: February 21, 1995
    Assignee: TDK Corporation
    Inventors: Yosuke Hitomi, Mari Murooka, Fuminori Tokuda
  • Process for producing binder resin and developer composition for electrophotography
    Patent number: 5391695
    Abstract: A process for producing a binder resin is disclosed, which comprises blending in a reactor a raw monomer for a first polymerization system and a raw monomer for a second polymerization system which undergoes polymerization through a reaction path different from a reaction path of said first polymerization system and then conducting said first and second polymerization reactions in the same reactor. A toner and a developer composition employing the binder resin are also disclosed. The binder resin can easily be pulverized and can give toners and developer compositions which hold a good charge and from which an environmentally stable fixed image can be obtained.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: February 21, 1995
    Assignee: Kao Corporation
    Inventors: Kuniyasu Kawabe, Yoko Matsumoto
  • Flame-retardant poly (polyisocyanate-organic phosphorus) products
    Patent number: 5391583
    Abstract: Flame-retardant poly (polyisocyanate-organic phosphorus) products are produced by mixing and reacting an organic phosphorus containing compound and a polyisocyanate compound in the presence of a polyisocyante catalyst. No other blowing agent is necessary.The flame-retardant polyurethane foam products may be used for thermal and sound-insulation, for cushioning, for molding useful objects and as a cavity filler.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: February 21, 1995
    Inventor: David H. Blount
  • Poly(3-hydroxyalkanoates)
    Patent number: 5391708
    Abstract: Novel poly(3-hydroxyalkanoates), such as poly(3-hydroxybutyrate), and blends of these with other polymers are disclosed. A novel process for producing these poly(3-hydroxyalkanoates) is also disclosed which entails polymerizing one or more .beta.-substituted-.beta.-propiolactone(s) under polymerization conditions in the substantial absence of water in the presence of an anionic initiator.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: February 21, 1995
    Assignee: Eastman Chemical Company
    Inventors: John C. Hubbs, Marti N. Harrison, Charles Buchanan
  • Process for producing (co)polycarbonate and (co)polycarbonate composition
    Patent number: 5391690
    Abstract: A process for producing a (co)polycarbonate or a (co)polyestercarbonate having a high molecular weight and excellent hue, heat stability and mechanical properties by reacting a dihydroxyl compound with a diester of carbonic acid and/or a diester of dicarbonic acid in the presence of a transesterification catalyst, wherein at least part of the reaction process is conducted in the presence of a specified organic phosphorus compound, or, in the presence of a specified organic phosphorus compound and a hindered phenol compound. A (co)polycarbonate or (co)polyester-carbonate composition having excellent hue, heat stability and mechanical properties, comprising a (co)polycarbonate and/or a (co)polyestercarbonate and, a specified organic phosphorus compound, or, a specified organic phosphorus compound and a hindered phenol compound.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: February 21, 1995
    Assignee: Daicel Chemical Industries,Ltd.
    Inventors: Tatsuya Kanno, Tsutomu Yamato, Yasuhiro Oshino, Yutaka Fukuda, Yoshihiro Iguchi, Takaaki Kuwana, Toshihiro Matsumoto
  • Process for producing aromatic polycarbonate
    Patent number: 5391691
    Abstract: A process for producing an aromatic polycarbonate with improved heat resistance comprising melt polycondensing an aromatic diol compound and a carbonic acid diester compound in the presence of an interesterification catalyst and in the co-presence of an organosilicon compound.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: February 21, 1995
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Masuzo Yokoyama, Kazuhide Takakura, Junji Takano
  • Polyurethane compositions having enhanced corrosion inhibiting properties
    Patent number: 5391686
    Abstract: A novel polyurethane formulation especially effective as a corrosion preventing coating for metallic substrates. The polyurethane is prepared by mixing two components, one being a mixture of high and low molecular weight polyol compounds and the other being a polymeric methylene polyphenyl isocyanate (MDI).
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: February 21, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Jalandar Y. Jadhav, Cung Vu