Patents by Inventor Jan van Turnhout

Jan van Turnhout 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).

  • Patent number: 6044201
    Abstract: A device for storing and gradually dispensing heat or cold includes a container having a partially heat-conducting wall enclosing a space with material having a high heat capacity including a semisolid hydrogel formed by a crosslinked hydrophilic polymer containing 90-99.5% of water, based on the sum of polymer and water.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: March 28, 2000
    Assignee: Technische Universiteit Delft
    Inventor: Jan Van Turnhout
  • Patent number: 4749348
    Abstract: The present invention relates to a continuous method for manufacturing an electret filter medium from dielectric material having an open or porous structure, said method comprising the steps of continuously feeding a web of dielectric material with a substantially closed dielectric foil adjacent to at least one major face thereof into a corona discharge device, reducing the thickness of the web of dielectric material and charging the web of reduced thickness dielectric material by means of a corona discharge and to apparatus for carrying out said method.
    Type: Grant
    Filed: February 3, 1986
    Date of Patent: June 7, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Petrus T. A. Klaase, Jan van Turnhout
  • Patent number: 4588537
    Abstract: The present invention relates to a continuous method for manufacturing an electret filter medium from dielectric material having an open or porous structure, said method comprising the steps of continuously feeding a web of dielectric material with a substantially closed dielectric foil adjacent to at least one major face thereof into a corona discharge device, reducing the thickness of the web of dielectric material and charging the web of reduced thickness dielectric material by means of a corona discharge and to apparatus for carrying out said method.
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: May 13, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Petrus T. A. Klaase, Jan van Turnhout
  • Patent number: 4456648
    Abstract: Fibrous web electrets are given added properties through inclusion of a particulate material, such as a flame-retardant agent, in less than all the layers of a plural-layer film from which fibers are fibrillated, and by use of a brominated derivative of bisphenol A as the flame-retardant agent.
    Type: Grant
    Filed: September 9, 1983
    Date of Patent: June 26, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jan W. C. Adamse, Jan Van Turnhout
  • Patent number: 4363860
    Abstract: A photoconductive layer is produced upon a substrate by coating the substrate with a solution in an organic solvent of a polyamic acid and of 2,4,7-trinitro-9-fluorenone (TNF) and/or 2,4,5,7-tetranitro-9-fluorenone and heating the coated substrate at a temperature not exceeding 150.degree. C. to form on the substrate a polyimide coating containing the said fluorenone compound as a photosensitizer.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: December 14, 1982
    Assignee: Nederlandsch Organisatie voor Toegepast-Natuurvetenschappelijk Onderzoek Ten Behoeve van Nyserheid, Handel en Verkeer
    Inventors: Jan van Turnhout, Ramesh C. Ahuja
  • Patent number: 4355089
    Abstract: A photoconductive layer is produced upon a substrate by coating the substrate with a solution in an organic solvent of a polyamic acid and of 2,4,7-trinitro-9-fluorenone (TNF) and/or 2,3,4,7-tetranitro-9-fluorenone and heating the coated substrate at a temperature not exceeding 150.degree. C. to form on the substrate a polyimide coating containing the said fluorenone compound as a photosensitizer.
    Type: Grant
    Filed: August 8, 1978
    Date of Patent: October 19, 1982
    Assignee: Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Ten Behoeve Van Nijverheid, Handel En Verkeer
    Inventors: Jan van Turnhout, Ramesh C. Ahuja
  • Patent number: 4178157
    Abstract: A method for forming a filter of electrically charged electret fiber material, consisting of a high molecular weight, nonpolar polymeric substance, comprising drawing, charging, and fibrillating a foil of said high molecular weight substance. The fibrillated foil is wound and then crimping is effected.
    Type: Grant
    Filed: December 21, 1977
    Date of Patent: December 11, 1979
    Assignee: N. V. Verto
    Inventors: Jan van Turnhout, Johannes C. Rieke
  • Patent number: 4037310
    Abstract: A method of manufacturing a homopolar electret from a foil of a non-polar polymer, preferably TEFLON-FEP or PFA. The polymer foil is formed into an electret by heating it above the transition temperature and below the melting temperature of the polymer under the influence of an electrostatic field of a magnitude such that a homopolar charge is injected into the foil which is greater than the desired value, and the foil then being cooled to room temperature. However, before the transition temperature is reached during cooling, the electrostatic field is switched off so that the charge surplus is thereby removed.If the foil is disposed between two electrodes, a better result can be obtained by providing the foil with a vacuum-deposited metal layer in contact with the positive electrode during the formation.The charging time lies between 0.02 secs. and 1 min. and is preferably smaller than 5 secs.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: July 26, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Jan van Turnhout
  • Patent number: 4016375
    Abstract: An electrostatic transducer, provided with at least two electrodes arranged opposite each other, of which one electrode forms part of a diaphragm and of which the other electrode is fixed, a disc of an electret material being disposed between the electrodes and at one of the electrodes, which electret material consists of a polymer of tetrafluoroethylene and perfluorine (alkylvinylether), in which the alkylgroup contains from 1 to 5 carbon atoms.This yields the advantage that when employed as a diaphragm said foil is extremely suited for use in loudspeakers and larger microphones.
    Type: Grant
    Filed: March 11, 1975
    Date of Patent: April 5, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Jan Van Turnhout
  • Patent number: 3998916
    Abstract: A method for the manufacture of an electrically charged fibrous filter from a highly molecular non-polar fiber material wherein a web of the fiber material is continuously fed and stretched. At least one side of the stretched web is homopolarly charged by a plurality of corona charging elements. The charged web material is then fibrillated, collected and processed into a filter.
    Type: Grant
    Filed: March 25, 1975
    Date of Patent: December 21, 1976
    Assignee: N.V. Verto
    Inventor: Jan van Turnhout
  • Patent number: RE30782
    Abstract: A method for the manufacture of an electrically charged fibrous filter from a highly molecular non-polar fiber material wherein a .[.web.]. .Iadd.film .Iaddend.of the fiber material is continuously fed and stretched. At least one side of the stretched .[.web.]. .Iadd.film .Iaddend.is homopolarly charged by a plurality of corona charging elements. The charged .[.web.]. .Iadd.film .Iaddend.material is then fibrillated, collected and processed into a filter.
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: October 27, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Jan van Turnhout
  • Patent number: RE31285
    Abstract: A method for forming a filter of electrically charged electret fiber material, consisting of a high molecular weight, nonpolar polymeric substance, comprising drawing, charging, and fibrillating a foil of said high molecular weight substance. The fibrillated foil is wound and then crimping is effected.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: June 21, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jan van Turnhout, Johannes C. Rieke
  • Patent number: RE32171
    Abstract: A method for the manufacture of an electrically charged fibrous filter from a highly molecular non-polar fiber material wherein a .[.web.]. .Iadd.film .Iaddend.of the fiber material is continuously fed and stretched. At least one side of the stretched .[.web.]. .Iadd.film .Iaddend.is homopolarly charged by a plurality of corona charging elements. The charged .[.web.]. .Iadd.film .Iaddend.material is then fibrillated, collected and processed into a filter.
    Type: Grant
    Filed: August 1, 1983
    Date of Patent: June 3, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Jan van Turnhout