Oxygen Bonded Directly To The -o-c(=o)o- Group By Nonionic Bonding (e.g., Monoperoxycarbonates, Etc.) Patents (Class 558/263)
  • Patent number: 11634537
    Abstract: The present invention is directed to a polymerizable composition comprising (A) a reaction product of: (a) diethyleneglycol bischloroformate, ethyleneglycol bischloroformate, or combinations thereof; (b) allyl alcohol; (c) optionally, a cyclic polyol selected from the group consisting of a cycloaliphatic polyol having at least one secondary hydroxyl group, a heterocyclic polyol having primary and/or secondary hydroxyl groups, and mixtures thereof; and (d) optionally, at least one linear or branched aliphatic polyol having two to six hydroxyl groups; and (B) an organic peroxide comprising at least three peroxide groups. A polymerizate and/or an optical article comprising the polymerizable compositions of the invention are also provided.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: April 25, 2023
    Assignee: Arkema Inc.
    Inventors: Robert D. Herold, Marco Herrera, Thomas H. Kozel, Leonard H. Palys, Brandy Slezak, Bruno Georges Van Hemelryck
  • Patent number: 9150682
    Abstract: Compounds for use as radical generating agents for modifying polymer compositions, wherein the modified polymer compositions and the process for preparing the polymer compositions are utilized with wires or cables thereby forming one or more layers of a wire of the cable.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: October 6, 2015
    Assignee: Borealis AG
    Inventor: Daniel Nilsson
  • Patent number: 8741255
    Abstract: Peroxo-carbonates derived from molten alkali and/or Group II metal salts, particularly carbonate salts are used as catalysts in oxidation and epoxidation reactions. Transition metal compounds may be included to improve the selectivity of the reactions.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: June 3, 2014
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Helge Jaensch, Gary David Mohr
  • Publication number: 20110178324
    Abstract: The present application relates to a method for manufacturing tert-butyl hydroperoxide that includes the following steps: a) fermenting renewable raw materials and optionally purifying the same to produce a mixture containing at least butanol; b) dehydrating the butanol into butane; c) converting the butane into isobutene and optionally hydrating the isobutene to produce tert-butanol; d) reacting the product of step c) with hydrogen peroxide so as to produce tert-butyl hydroperoxide; and e) isolating the tert-butyl hydroperoxide. The invention also relates to tert-butyl hydroperoxide containing carbon atoms from renewable resources, to the compositions containing said tert-butyl hydroperoxide, and also relates to the use thereof as a polymerization initiator.
    Type: Application
    Filed: September 24, 2009
    Publication date: July 21, 2011
    Applicant: Arkema France
    Inventors: Serge Hub, Phillppe Maj
  • Patent number: 7960558
    Abstract: The compounds of the general Formula (I), wherein R1 is aryl or alkyl; R2 represents alkyl; R3 represents alkyl or aralkyl, are valuable pharmaceutical intermediates, which can be prepared by reacting a compound of the general Formula (IV) (wherein the definitions of R1 and R2 are as above), with at least 2 molar equivalents of the compound of the general Formula (VI) (wherein X represents halogen or tertiary butyloxycarbonyloxy group and R3 is as defined above). The known compounds of the general Formula (II) (wherein R1 and R2 are as defined above) are prepared by reacting the compounds of the general Formula (I) with thionyl chloride. The compounds of the general Formula (I) are new intermediates useful in the synthesis of pharmaceutically active ingredients, particularly in the preparation of ACE-inhibitors, e.g. enalapril, perindopril or ramipril.
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: June 14, 2011
    Assignee: Egis Gyogyszergyar Nyilvanosan Mukodo Reszvenytarsasag
    Inventors: Márta Porcs-Makkay, Gyula Simig, Tibor Mezei, Angéla Veressné Pandur, Gyula Lukács
  • Publication number: 20100286404
    Abstract: The compounds of the general Formula (I), wherein R1 is aryl or alkyl; R2 represents alkyl; R3 represents alkyl or aralkyl, are valuable pharmaceutical intermediates, which can be prepared by reacting a compound of the general Formula (IV) (wherein the definitions of R1 and R2 are as above), with at least 2 molar equivalents of the compound of the general Formula (VI) (wherein X represents halogen or tertiary butyloxycarbonyloxy group and R3 is as defined above). The known compounds of the general Formula (II) (wherein R1 and R2 are as defined above) are prepared by reacting the compounds of the general Formula (I) with thionyl chloride. The compounds of the general Formula (I) are new intermediates useful in the synthesis of pharmaceutically active ingredients, particularly in the preparation of ACE-inhibitors, e.g. enalapril, perindopril or ramipril.
    Type: Application
    Filed: May 11, 2007
    Publication date: November 11, 2010
    Inventors: Marta Porcs-Makkay, Gyula Simig, Tibor Mezei, Angéla Veressné Pandur, Gyula Lukács
  • Patent number: 7659420
    Abstract: Chemically protected dihydroxyacetone and/or dimers are used to make polycarbonates, poly(acetal carbonate)s, poly(spiroacetal)s, polyesters and polyurethanes.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: February 9, 2010
    Assignee: Cornell Research Foundation, Inc
    Inventors: David A. Putnam, Alexander Zelikin
  • Publication number: 20090030214
    Abstract: Peroxo-carbonates derived from molten alkali and/or Group II metal salts, particularly carbonate salts are used as catalysts in oxidation and epoxidation reactions, transition metal compounds may be included to improve the selectivity of the reactions.
    Type: Application
    Filed: July 27, 2007
    Publication date: January 29, 2009
    Inventors: Helge Jaensch, Gary David Mohr
  • Patent number: 7078553
    Abstract: The invention relates to peroxides derivable from The invention further relates to the process to make these peroxides as well as to their use in polymerization, curing, and modification reactions.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: July 18, 2006
    Assignee: Akzo Nobel N.V.
    Inventors: Anna Gerdine Van De Bovenkamp-Bouwman, Joachim Willem J. Van Gendt, John Meijer, Andreas Herman Hogt, Andreas Petrus Van Swieten
  • Patent number: 7022264
    Abstract: The present invention provides a solid polymer electrolyte; a polymerizable composition having low viscosity and excellent processability for obtaining the solid polymer electrolyte; and a polymerizable compound having low viscosity, and good polymerizability and stability for use in the polymerizable composition. The present invention also provides primary and secondary batteries capable of working with high capacity and current; an electric double-layer capacitor ensuring high output voltage, large takeout current, and good processability; and an electrochromic device favored with high response speed. Each thereof use the solid polymer electrolyte of the present invention and are ensured with long life, excellent safety free of liquid leakage, high reliability and production at a low cost.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: April 4, 2006
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Masataka Takeuchi, Shuichi Naijo, Ayako Nishioka
  • Publication number: 20040260111
    Abstract: The invention relates to peroxides derivable from 1
    Type: Application
    Filed: April 16, 2003
    Publication date: December 23, 2004
    Inventors: Anna Gerdine Van De Bovenkamp-Bouwman, Joachim Willem J. Van Gendt, John Meijer, Andreas Herman Hogt, Andreas Petrus Van Swieten
  • Publication number: 20040215034
    Abstract: A process for producing peroxydicarbonates comprising first reacting at least one inorganic peroxide with at least one alkali metal hydroxide to form at least one alkali metal peroxide. The at least one alkali metal peroxide is added to a mixture of at least one haloformate, at least one dispersant and water. The mixture is homogenized during the entire reaction to form a peroxydicarbonate. The peroxydicarbonate is dispersed as small droplets of from 1 to 10 microns in size in the aqueous mixture. The entire mixture is added to a polymerization reactor containing an ethylenically unsaturated monomer. The peroxydicarbonate functions as the free radical initiator to polymerize the monomer. The peroxydicarbonate is substantially free of organic solvents and plasticizers. The resulting polymers are of high quality.
    Type: Application
    Filed: May 18, 2004
    Publication date: October 28, 2004
    Inventor: Ross James Cozens
  • Patent number: 6552215
    Abstract: The invention relates to peroxides derivable from The invention further relates to the process to make these peroxides as well as to their use in polymerization, curing, and modification reactions.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: April 22, 2003
    Assignee: Akzo Nobel N.V.
    Inventors: Anna Gerdine Van De Bovenkamp-Bouwman, Joachim Willem J. Van Gendt, John Meijer, Andreas Herman Hogt, Andreas Petrus Van Swieten
  • Patent number: 6482970
    Abstract: The invention is drawn to compounds of formula (I) which is HOO—C(R1)(R2)—OO—(R1)(R2)—OO—(C═O)—(O)nR3 wherein n is 0 or 1, R1 and R2 are independently selected from the group consisting of H, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, C7-C20 alkaryl which may be optionally substituted or R1 and R2 can form a C3-C12 cycloalkyl group and R3 is selected from C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl which can be optionally substituted; a process for the preparation of the peroxy esters or peroxy carbonates of formula (I); and the method of using the compounds as polymer initiators or curing agents.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: November 19, 2002
    Assignee: Akzo Nobel NV
    Inventors: Anna Gerdine Van De Bovenkamp-Bouwman, Joachim Willem J. Van Gendt, John Meijer, Bart Fischer, Andreas Herman Hogt
  • Patent number: 6469071
    Abstract: Polyester based polycarbonate (meth)acrylates prepared by the reaction of a alkylene or arylene diol polycarbonate with an anhydride or its dicarboxylic acid to form a carboxyl terminated diester, reacting the diester with a diglycidyl ether and an acrylic or methacrylic acid to form an acrylate terminate polymer which is useful for radiation cured coatings which have superior adhesion and reverse impact strength when applied to plastic substrates.
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: October 22, 2002
    Assignee: Sartomer Technology Company, Inc.
    Inventors: Mingxin Fan, Gary Ceska, James Horgan, Robert Adams, William Schaeffer, Josh Oliver
  • Publication number: 20020019555
    Abstract: The invention relates to a process for the preparation of an organic solution of dialkyl peroxydicarbonate which is particularly suited for use in the aqueous suspension polymerization of halogenated monomers. According to this process, the dialkyl peroxydicarbonate, prepared by the reaction in water of appropriate amounts of alkyl haloformate with an inorganic peroxide, is separated by extraction by means of a water-insoluble organic solvent chosen from conventional chain-regulating agents for halogenated polymers.
    Type: Application
    Filed: April 26, 2001
    Publication date: February 14, 2002
    Inventors: Thierry Lannuzel, Vincent Bodart, Xavier Bacque, Guy Laurent, Fredy Declerck
  • Patent number: 6111042
    Abstract: The novel polyfunctional peroxides are compounds represented by the following general formula (1):R.sup.1 -CX.sub.3 ( 1)wherein R.sup.1 represents a linear alkyl group having 1 to 3 carbon atoms; and X represents a group: ##STR1## (wherein R.sup.2 represents a linear or branched alkyl group having 1 to 5 carbon atoms). Such polyfunctional peroxides include 1,1,1-tris(t-butylperoxycarbonyloxymethyl)propane and the like. The polymerization initiators for vinyl monomers comprise such polyfunctional peroxides. In the process for polymerizing vinyl monomers, a vinyl monomer is polymerized employing such polyfunctional peroxide at 60 to 160.degree. C.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: August 29, 2000
    Assignee: NOF Corporation
    Inventors: Hideyo Ishigaki, Yasumasa Watanabe, Tomomi Satou
  • Patent number: 5981787
    Abstract: Novel peroxyoxalate compositions of Structure A, ##STR1## and use of the novel monoperoxyoxalates of Structure A as initiators for polymerizing ethylenically unsaturated monomers and for curing of unsaturated polyester resins are disclosed.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: November 9, 1999
    Assignee: Elf Atochem North America, Inc.
    Inventors: Jose Sanchez, Daryl L. Stein
  • Patent number: 5973181
    Abstract: The novel polyfunctional peroxides are compounds represented by the following general formula (1):R.sup.1 --CX.sub.3 (1)wherein R.sup.1 represents a linear alkyl group having 1 to 3 carbon atoms; and X represents a group: ##STR1## (wherein R.sup.2 represents a linear or branched alkyl group having 1 to 5 carbon atoms).Such polyfunctional peroxides include 1,1,1-tris(t-butylperoxycarbonyloxymethyl)propane and the like. The polymerization initiators for vinyl monomers comprise such polyfunctional peroxides. In the process for polymerizing vinyl monomers, a vinyl monomer is polymerized employing such polyfunctional peroxide at 60 to 160.degree. C.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: October 26, 1999
    Inventors: Hideyo Ishigaki, Yasumasa Watanabe, Tomomi Satou
  • Patent number: 5760149
    Abstract: Poly(monoperoxycarbonates) of the structure: ##STR1## where R, R.sup.1 and n are defined in the summary of the invention such as 1,1,1-tris(t-butylperoxycarbonyloxymethyl)ethane, intermediates for their preparation as well as processes for their preparation and use are disclosed. The monoperoxycarbonate compounds are useful in initiating the polymerization of ethylenically unsaturated monomers, particularly styrene, curing of unsaturated polyester resins, and in modifying the molecular weight of polymers such as by crosslinking or controlled chain degradation.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: June 2, 1998
    Assignee: Elf Atochem North America, Inc.
    Inventors: Jose Sanchez, John Salvatore Yormick, Jerome Wicher, Kenneth George Malone
  • Patent number: 5723562
    Abstract: Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention. The compounds of Formula I may be prepared by reacting hydroxy-containing tertiary hydroperoxides with diacid halides, phosgene, dichloroformates, diisocyanates, anhydrides and lactones to form the functionalized peroxides. These reaction products may be further reacted, if desired, with dialcohols, diamines, aminoalcohols, epoxides, epoxy alcohols, epoxy amines, diacid halides, dichloroformates and diisocyanates to form additional functionalized peroxides.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: March 3, 1998
    Assignee: Elf Atochem North America, Inc.
    Inventor: Daryl L. Stein
  • Patent number: 5536790
    Abstract: Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention. The compounds of Formula I may be prepared by reacting hydroxy-containing tertiary hydroperoxides with diacid halides, phosgene, dichloroformates, diisocyanates, anhydrides and lactones to form the functionalized peroxides. These reaction products may be further reacted, if desired, with dialcohols, diamines, aminoalcohols, epoxides, epoxy alcohols, epoxy amines, diacid halides, dichloroformates and diisocyanates to form additional functionalized peroxides.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 16, 1996
    Assignee: Elf Atochem North America, Inc.
    Inventor: Daryl L. Stein
  • Patent number: 5534596
    Abstract: Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention. The compounds of Formula I may be prepared by reacting hydroxy-containing tertiary hydroperoxides with diacid halides, phosgene, dichloroformates, diisocyanates, anhydrides and lactones to form the functionalized peroxides. These reaction products may be further reacted, if desired, with dialcohols, diamines, aminoalcohols, epoxides, epoxy alcohols, epoxy amines, diacid halides, dichloroformates and diisocyanates to form additional functionalized peroxides.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 9, 1996
    Assignee: Elf Atochem North America, Inc.
    Inventor: Daryl L. Stein
  • Patent number: 5466855
    Abstract: Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: November 14, 1995
    Assignee: Elf Atochem North America, Inc.
    Inventor: Daryl L. Stein
  • Patent number: 5304649
    Abstract: Novel hydroxy peroxides of the Structure AHO--R.sub.11 --X--OO--R (A)[wherein R--, --R.sub.11 -- and --X-- are as defined in the Summary of the Invention Section], having 10 hour half-life temperatures of 85.degree.-100.degree. C., the processes for their preparation, and the use of these novel compositions in curing of unsaturated polyester resins and in initiating polymerization of ethylenically unsaturated monomers.
    Type: Grant
    Filed: January 8, 1993
    Date of Patent: April 19, 1994
    Assignee: Elf Atochem North America, Inc.
    Inventors: Jose Sanchez, Arthur L. Baron
  • Patent number: 5292914
    Abstract: An organic peroxide consisting of 1 to 30 repeating units represented by the formula ##STR1## wherein R stands for one group selected from the class consisting of ethylene, acetylene, cyclohexylene, and phenylene groups and one of 1 and m stands for an integer of at least 1 and 1+m stands for an integer in the range of from 6 to 220. Polymerization initiator for a vinyl monomer consisting of the organic peroxide mentioned above. A method for polymerizing a vinyl monomer by using the polymerization initiator mentioned above.
    Type: Grant
    Filed: July 1, 1993
    Date of Patent: March 8, 1994
    Assignee: NOF Corporation
    Inventors: Shuji Suyama, Tomoyuki Nakamura, Hiroyuki Nagai, Mieko Takei
  • Patent number: 5210164
    Abstract: A novel peroxy aryl carbonate which has the both properties of polymerization-initiating and regulating abilities, can be used as a radical polymerization initiator to regulate the polymerization rate, the polymerization degree and molecular weight distribution of the polymer and the like, and therefore produce superior styrene resin and methyl methacrylate syrup.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: May 11, 1993
    Assignee: Nippon Oil and Fats Co., Ltd.
    Inventors: Takeshi Komai, Kazuo Matsuyama, Isao Honma
  • Patent number: 5008353
    Abstract: A novel peroxy aryl carbonate which has the both properties of polymerization-initiating and regulating abilities, can be used as a radical polymerization initiator to regulate the polymerization rate, the polymerization degree and molecular weight distribution of the polymer and the like, and therefore produce superior styrene resin and methyl methacrylate syrup.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: April 16, 1991
    Assignee: Nippon Oil and Fats Co., Ltd.
    Inventors: Takeshi Komai, Kazuo Matsuyama, Isao Honma
  • Patent number: 4988451
    Abstract: A particulate additive is reported which is an intimately blended mixture of a precursor, a stabilizing agent and a dispersing agent. The precursor is a quaternized ammonium or phosphonium substituted carbonic acid ester. A C.sub.4 or higher organic acid having at least one carboxylic group, such a lauric acid, or a solid inorganic acid, such as potassium bisulfate, is required as the stabilizing agent. Various alkoxylated fatty alcohols, fatty acids or alkylated phenols are utilized as the dispersing agent. These particulate additives are employed as adjuncts in bleaching-detergent compositions.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: January 29, 1991
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Charles C. Nunn, William J. Worley
  • Patent number: 4929747
    Abstract: A novel peroxy aryl carbonate which has the both properties of polymerization-initiating and regulating abilities, can be used as a radical polymerization initiator to regulate the polymerization rate, the polymerization degree and molecular weight distribution of the polymer and the like, and therefore produce superior styrene resin and methyl methacrylate syrup.
    Type: Grant
    Filed: August 13, 1986
    Date of Patent: May 29, 1990
    Assignee: Nippon Oil & Fats Company, Ltd.
    Inventors: Takeshi Komai, Kazuo Matsuyama, Isao Honma
  • Patent number: 4818426
    Abstract: A bleach precursor compound, its peroxygen acid derivative, and detergent compositions containing these materials are disclosed herein. The bleach precursor structurally comprises a quaternized ammonium or phosphonium group linked to a carbonate moiety having a leaving group. Upon perhydrolysis in the presence of hydrogen peroxide and a basic aqueous media, there is generated a peroxycarbonic acid bleach.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: April 4, 1989
    Assignee: Lever Brothers Company
    Inventors: Robert W. R. Humphreys, Stephen A. Madison
  • Patent number: 4751296
    Abstract: A process for 4-halomethylazetidin-2-ones is provided which comprises mixing in an inert solvent a positive halogen reagent in the presence of a weak base with a .beta.,.gamma.-unsaturated O-acylhydroxamate of the formula ##STR1## wherein R is protected amino, lower alkyl or phenyl substituted lower alkyl, R.sub.2 is a substituent such as lower alkyl which may be substituted by formyl, hydroxy, halogen, etc., and R.sub.1 is alkoxy, benzyloxy, etc. When R is a protected amino group, the process provides cis-4-halomethylazetidin-2-ones, while when R is alkyl or phenylalkyl, the trans isomer is obtained. The 4-halomethylazetidinones are useful intermediates for known antibiotic compounds.
    Type: Grant
    Filed: August 6, 1986
    Date of Patent: June 14, 1988
    Assignee: University of Notre Dame du Lac
    Inventor: Marvin J. Miller
  • Patent number: 4751015
    Abstract: A bleach precursor compound, its peroxygen acid derivative, and detergent compositions containing these materials are disclosed herein. The bleach precursor structurally comprises a quaternized ammonium or phosphonium group linked to a carbonate moiety having a leaving group. Upon perhydrolysis in the presence of hydrogen peroxide and a basic aqueous media, there is generated a peroxycarbonic acid bleach.
    Type: Grant
    Filed: March 17, 1987
    Date of Patent: June 14, 1988
    Assignee: Lever Brothers Company
    Inventors: Robert W. Humphreys, Stephen A. Madison
  • Patent number: 4659855
    Abstract: Certain novel aryl sulfonyl fluorides, their preparation, and their use in inhibiting serine proteases with chymotrypsin-like and elastase-like specificity.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: April 21, 1987
    Assignee: Georgia Tech Research Corporation
    Inventor: James C. Powers