Patents by Inventor Gerhard Wick
Gerhard Wick 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).
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Patent number: 5109077Abstract: A process is disclosed for the production of bio-compatible polyurethane, proceeding from cyclo aliphatic diisocyanate and macrodiol, which are reacted into a pre-adduct that is then chain lengthened with a mixture of the lower-molecular diol and a macrodiol. The so-obtained polyurethane displays high resistance in human and animal bodies and is suitable for the manufacture of catheters, blood pumps, heart valves, as well as bio-compatible lacquers and coatings.Type: GrantFiled: February 13, 1990Date of Patent: April 28, 1992Assignee: Azko NVInventor: Gerhard Wick
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Patent number: 4649991Abstract: A cross-counter-stream module for material and/or heat exchange done with a hollow filament bundle cast into a housing at its ends and a mechanism for conducting the material flow to the outside of the hollow filaments. The hollow filaments are cast at their ends as a stack into a housing, the stack being composed of one or more layers which consist of strata of hollow filaments fixed in a plane through cross-pieces transverse to their lumen directions, the cross-pieces being arranged tightly superimposed at all locations inside one layer, disposed at predetermined constant intervals, with the intermediate spaces between the hollow filaments filled by the cross-pieces at the places of crossing, and with the cross-pieces composed of a polymer with a melting point from 80.degree. to 190.degree. C. and a residual adhesion at room temperature. Preferably, the polymer is a polyamide, a polyethylene, a copolymer of polyethylene and vinyl acetate, or a copolyether-ester.Type: GrantFiled: December 22, 1981Date of Patent: March 17, 1987Assignee: Akzo NVInventors: Clemens Neuhaus, Rudiger Lucks, Hans G. Breidohr, Gerhard Wick
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Patent number: 4598136Abstract: Aliphatic embedding masses are disclosed, prepared by initially reacting one or more aliphatic diisocyanates with castor oil or a mixture of castor oil and further hydroxyl compounds, such as e.g., trimethylol propane into a NCO-group-displaying pre-adduct, and the pre-adduct is then hardened in a catalyzed reaction with a mixture containing castor oil, trimethylol propane and N-methyldiethanol amine. Preferably iron acetyl acetonate, dibutyl tin diacetate or titanium tetrabutylate are employed as catalysts. Isophoron diisocyanate is particularly suitable as diisocyanate.The embedding masses are useful for the embedding of membranes, preferably membranes to be employed in medical fields. The embedding masses are bio-compatible, especially with regard to blood, and are non-toxic. They allow for the embedding of membranes with the aid of automatic machinery. The embedding masses display no or only negligible swelling when used in contact with blood, blood-like and aqueous systems.Type: GrantFiled: March 26, 1985Date of Patent: July 1, 1986Assignee: Akzo NVInventor: Gerhard Wick
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Patent number: 4433128Abstract: Embedding masses are disclosed on the basis of fast-reacting polyurethane casting resins, which are obtained through reaction of an aromatic polyisocyanate with a mixture of castor oil and trimethylolpropane into an NCO-group-displaying pre-adduct and polymerization of this pre-adduct with a polypropyleneglycol or a mixture of polypropyleneglycol and trimethylolpropane in the presence of small amounts of a catalyst mixture composed of dialkyl tin dicarboxylate and tertiary amine. The polyurethane casting resins can harden in seconds-fast reaction, and are therefore preferably suitable for a continuous embedding of membranes in automatic machines, particularly of membranes for artificial organs.Type: GrantFiled: November 22, 1982Date of Patent: February 21, 1984Assignee: Akzo NVInventor: Gerhard Wick
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Patent number: 4391964Abstract: Embedding mass of polyurethane produced on the basis of castor oil, and a method for its production, wherein an aromatic diisocyanate is reacted with a mixture of castor oil and trimethylolpropane into an NCO-group displaying pre-adduct, the pre-adduct being mixed for network polymerization with castor oil or a mixture of castor oil and trimethylolpropane, and after embedding the mixture is hardened in the presence of catalyst, thereby characterized in that a titanium alkylate compound is used as catalyst in amounts from 7 to 700 ppm, calculated as elemental titanium. Preferably, the catalyst is a titanium tetraalkylate; in particular titanium tetrabutylate. Also, a titanium magnesium hexaalkylate may be used as titanium alkylate compound; preferably, titanium magnesium hexabutylate. Preferably the catalyst is present in amounts from 40 to 140 ppm, calculated as elemental titanium.Type: GrantFiled: February 22, 1982Date of Patent: July 5, 1983Assignee: Akzo NVInventors: Gerhard Wick, Helmut Schulze
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Patent number: 4380594Abstract: A filament of a thermoplastic synthetic polymer having a plurality of adjacent, separate discontinuous cavities is made by a process wherein a silicone oil and an inert gas or gas-forming substance are dispersed in a polymer melt, and the melt is extruded into a filament. The melt contains up to and including 1% by weight of the silicone oil, based on the weight of the melt, at the time it is extruded and up to and including 10% by weight of an inert gas.Type: GrantFiled: October 14, 1980Date of Patent: April 19, 1983Assignee: Akzona IncorporatedInventors: Erhard Siggel, Gerhard Wick, Heinz Linhart, Erich Kessler
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Patent number: 4359359Abstract: Production of a polyurethane embedding material from an aromatic diisocyanate in stoichiometric excess with a polyol mixture consisting essentially of castor oil and trimethylolpropane to first form a prepolymer containing unreacted isocyanate groups and being sufficiently flowable to permit coating onto membrane surfaces in all types of coating methods, and subsequently hardening the prepolymer by addition of a cross-linking agent consisting essentially of castor oil alone or another mixture of castor oil with trimethylolpropane in an amount sufficient to cross-link the prepolymer through at least a majority of its unreacted isocyanate groups. The products obtained in the invention are the embedding materials or the resulting hardened or cured embedded products or more simply "bedded" final products which have excellent properties particularly adapted to the mounting of semipermeable membranes in dialysis equipment to give an improved and more useful construction.Type: GrantFiled: January 5, 1981Date of Patent: November 16, 1982Assignee: Akzo N.V.Inventors: Klaus Gerlach, Gerhard Wick
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Patent number: 4344873Abstract: Potting media based on polyurethanes produced with castor oil, a process for their preparation as well as their use. To at least one of the ingredients of the potting medium is added a dialkyltin compound in an amount resulting in a content of from about 5 to 50 ppm, calculated as elementary tin, of the dialkyltin compound. A diisocyanate based on a carbon ring compound in stoichiometric excess is reacted with a mixture of castor oil and trimethylolpropane to a prepolymer having NCO-groups. Then the prepolymer is mixed with castor oil or a mixture of castor oil and trimethylolpropane for crosslinking. Preferred diisocyanates are aromatic diisocyanates having up to about 30 carbon atoms.The potting media exhibit a favorable course of the viscosity, wet excellently and distribute very rapidly and are particularly suited for the embedding of membranes.Type: GrantFiled: March 13, 1981Date of Patent: August 17, 1982Assignee: Akzo NVInventor: Gerhard Wick
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Patent number: 4272377Abstract: Production of a polyurethane embedding material from an aromatic diisocyanate in stoichiometric excess with a polyol mixture consisting essentially of castor oil and trimethylolpropane to first form a prepolymer containing unreacted isocyanate groups and being sufficiently flowable to permit coating onto membrane surfaces in all types of coating methods, and subsequently hardening the prepolymer by addition of a cross-linking agent consisting essentially of castor oil alone or another mixture of castor oil with trimethylolpropane in an amount sufficient to cross-link the prepolymer through at least a majority of its unreacted isocyanate groups. The products obtained in the invention are the embedding materials or the resulting hardened or cured embedded products or more simply "bedded" final products which have excellent properties particularly adapted to the mounting of semipermeable membranes in dialysis equipment to give an improved and more useful construction.Type: GrantFiled: March 26, 1979Date of Patent: June 9, 1981Assignee: Akzo N.V.Inventors: Klaus Gerlach, Gerhard Wick
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Patent number: 4164603Abstract: A filament of a thermoplastic synthetic polymer having a plurality of adjacent, separate discontinuous cavities is made by a process wherein a silicone oil and an inert gas or gas-forming substance are dispersed in a polymer melt, and the melt is extruded into a filament. The melt contains up to and including 1% by weight of the silicone oil, based on the weight of the melt, at the time it is extruded and up to and including 10% by weight of an inert gas.Type: GrantFiled: November 4, 1976Date of Patent: August 14, 1979Assignee: Akzona IncorporatedInventors: Erhard Siggel, Gerhard Wick, Heinz Linhart, Erich Kessler
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Patent number: 3979363Abstract: Polyurethane elastomeric filaments of improved physical properties and chemical resistance prepared by preforming the filamentary material such that the polyurethane contains at least about 100 up to about 700 milliequivalents/kilogram of reactive terminal amino groups, and then aftertreating this preformed filamentary polyurethane, optionally under simultaneous stretching, with an organic polyisocyanate and then preferably heating the treated material at an elevated temperature above about 140.degree.C. The polyurethane filamentary product is particularly useful in providing durable elastic filaments, fibers, threads, yarns, fabrics and similar textile materials.Type: GrantFiled: November 7, 1973Date of Patent: September 7, 1976Assignee: Akzo N.V.Inventors: Wiprecht Eberius, Gerhard Wick, Heinz Grotjahn, Eckart Jacobs