Patents Examined by John Kight, II
  • Patent number: 5414069
    Abstract: An electroluminescent polymer comprises a main chain and a plurality of side chains, each of the side chains comprising an electroluminescent group and a flexible spacer connecting the electroluminescent group to the main chain, the spacers and the main chain being such that the electroluminescent groups are not conjugated with one another. The nature of the main chain and the spacer groups can be varied to enhance solubility, film-forming ability and other characteristics of the polymer, without significantly changing the electroluminescent properties of the polymer.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: May 9, 1995
    Assignee: Polaroid Corporation
    Inventors: William J. Cumming, Russell A. Gaudiana, Richard T. Ingwall, Eric S. Kolb, Parag G. Mehta, Richard A. Minns
  • Patent number: 5408028
    Abstract: Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide.Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: April 18, 1995
    Inventors: Louis L. Wood, Gary J. Calton
  • Patent number: 5382710
    Abstract: The invention involves aromatic polyhydroxy compounds, including triaromatic bisphenols and tris-1,1,1-(4-hydroxyphenyl)] toluenes, and a process for the preparation thereof by reacting a phenolic compound, e.g. phenol, with a suitable halo-compound, for instance 1,1-dichloroethylbenzene, 1-chlorostyrene, or mixtures thereof. The reaction may be conducted in the presence or absence of a solvent; an excess of the phenolic compound can serve as the solvent. The product is conveniently recovered by removing the by-product HCl excess phenolic compound, excess solvent and cooling. Yields of bis-1,1-(4-hydroxyphenyl)-1-phenylethane which are greater than 90% of theoretical have been obtained by the reaction of phenol and 1,1-dichloroethylbenzene, and a large portion of the yield is para isomer.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: January 17, 1995
    Assignee: The Dow Chemical Company
    Inventors: Marlin E. Walters, W. Frank Richey, Emmett L. Tasset
  • Patent number: 5373082
    Abstract: A process for the production of polycarbonates by melt transesterification is disclosed. Accordingly, polycarbonate waste is dissolved in monophenols and at an elevated temperature and in the presence of a catalyst degraded to yield oligocarbonates, diaryl carbonates and diphenols. Following the optional separation of fillers and other additives there is produced by partial recondensation and the distillation of monophenol a higher viscosity oligocarbonate having a OH and aryl carbonate terminal groups and a weight average molecular weight of 8000 to 18000, the oligocarbonate thus produced is then polycondensed to form a polycarbonate resin.
    Type: Grant
    Filed: November 19, 1993
    Date of Patent: December 13, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Kauth, Steffen Kuhling, Wolfgang Alewelt, Dieter Freitag
  • Patent number: 5357004
    Abstract: Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide. Alkyl or substituted alkyl groups may be incorporated in the backbone of the polymer by adding a alkyl or substituted alkyl monoamine to maleic acid and ammonia and heating at 120.degree. C. or more until polymerization has occurred.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: October 18, 1994
    Assignee: Srchem Incorporated
    Inventors: Gary J. Calton, Louis L. Wood
  • Patent number: 5286842
    Abstract: A process for producing a biodegradable polymer, which comprises subjecting a cyclic compound of the following formula (1) or (2) to ring opening polymerization: ##STR1## wherein R.sub.1 is a C.sub.1-10 alkyl group, ##STR2## wherein R.sub.2 is a C.sub.1-10 alkyl group, and R.sub.3 is a hydrogen atom or a C.sub.1-10 alkyl group.
    Type: Grant
    Filed: June 30, 1992
    Date of Patent: February 15, 1994
    Assignee: Mitsubishi Kasei Corporation
    Inventor: Yoshiharu Kimura
  • Patent number: 5274069
    Abstract: A polyarylate is formed by reacting a mixture of esters of a dihydric phenol and trisphenol, at least one aromatic dicarboxylic acid, an alkali metal catalyst, an inert diluent having a boiling point of from about 200.degree. C. to about 300.degree. C. Polyarylates of improved shear sensitivity and higher molecular weight can be formed.
    Type: Grant
    Filed: September 29, 1992
    Date of Patent: December 28, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Richard Vicari, Mark A. Murphy
  • Patent number: 5268259
    Abstract: A process for preparing a toner donor roll having an integral electrode pattern involving: (a) providing a cylindrically shaped insulating member; (b) coating the insulating member with a photoresist; (c) patterning the photoresist by exposure to light, resulting in a first photoresist portion corresponding to the electrode pattern and a second photoresist portion corresponding to the remainder of the photoresist; (d) removing the first photoresist portion, thereby exposing the portion of the insulating member to be overlaid with the electrode pattern; and (e) depositing conductive metal on the portion of the insulating member formerly overlaid with the first photoresist portion, resulting in the electrode pattern.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: December 7, 1993
    Assignee: Xerox Corporation
    Inventor: Donald S. Sypula
  • Patent number: 5232991
    Abstract: For the preparation of thermoplastic materials based on (a) homopolymers or copolymers of vinyl chloride and (b) polyacrylates having a glass transition temperature of less than -20.degree. C., firstly the acrylate is polymerized in aqueous emulsion in the presence of crosslinking compounds copolymerizable with the acrylates and having at least two nonconjugated double bonds. Secondly, the vinyl chloride or vinyl chloride with up to 20% by weight of copolymerizable monomers is heated with an initiator, a suspension agent system and optionally additives in an aqueous suspension to a temperature of about .gtoreq.30.degree. C. The polyacrylate is subsequently added and polymerization carried out at temperatures of about >30.degree. C. to the desired conversion. The resulting polymers exhibit improved particle size distribution, good reproducibility of the bulk density and in particular caked deposits on the wall are dramatically reduced during polymerization.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: August 3, 1993
    Assignee: Huels Aktiengesellschaft
    Inventors: Harald Sturm, Armin Boebel, Karl-Heinz Prell
  • Patent number: 5169929
    Abstract: Poly(phenylene) that is substantially free of insoluble material is prepared by the polymerization of a lithioarylhalide compound in the presence of a polar aprotic compound such as hexamethylphosphoramide, N,N,N',N'-tetramethylethylenediamine or hexamethylphosphorous triamide. The preferred reaction involves the polymerization of 1-bromo-4-lithiobenzene in the presence of hexamethylphosphoramide. The 1-bromo-4-lithiobenzene may be synthesized by reacting 1,4-dibromobenzene with t-butyllithium. These same types of reactions can also be used to synthesis other benzenoid polymers.
    Type: Grant
    Filed: June 25, 1990
    Date of Patent: December 8, 1992
    Assignee: University of South Carolina
    Inventors: James M. Tour, Eric B. Stephens
  • Patent number: 5084553
    Abstract: The invention relates to new copolymers of lactic acid and tartaric acid, the preparation and use thereof.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: January 28, 1992
    Assignee: Boehringer Ingelheim KG
    Inventors: Joachim Hess, Klaus R. Muller
  • Patent number: 4312803
    Abstract: Thermally stable polycarbonate compositions are obtained by admixing with a high molecular weight aromatic polycarbonate resin a stabilizing amount of a bisphosphite.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: January 26, 1982
    Assignee: General Electric Company
    Inventors: Ronald L. Markezich, Gary L. Freimiller, Walter K. Olander, Robert J. Axelrod