Patents by Inventor Hans Lichtenstein
Hans Lichtenstein 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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Publication number: 20130074930Abstract: The invention relates to a combination of fluorescence conversion dyes in plastics mouldings made of polymethyl (meth)acrylate, where these are used to convert natural insolation into light that can be used by the solar cells.Type: ApplicationFiled: July 5, 2011Publication date: March 28, 2013Applicant: Evonik Roehm GmbHInventors: Hans Lichtenstein, Claudius Neumann
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Publication number: 20090146548Abstract: The invention relates to an apparatus for illumination with blue, green, yellow or red light-emitting diodes (LEDS), comprising one or more coloured LEDs and a light-scattering cover associated with the LED colour and composed of coloured plastic and having a base colour derived from one or more non-fluorescent dyes, characterized in that the light-scattering cover comprises, in addition to the base colour, at least one fluorescent dye associated in terms of colour with the base colour, where the dye mixture has been adjusted in such a way that the reflectance of the light-scattering cover is at least 28% at the wavelength of the energy maximum of the LED(S) used, where, based on the standard chromaticity diagram and on the colour loci of the reflected light from the light-scattering cover and on the colour locus of the LED(s) used, the following alternative relationship applies to the absolute value of the difference between the x value of the light-scattering cover and the x value of the LED and the absolutType: ApplicationFiled: November 9, 2006Publication date: June 11, 2009Applicant: EVONIK ROEHM GMBHInventors: Hans Lichtenstein, Damrien Machert
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Patent number: 7497972Abstract: The invention relates to a moulding composed of a plastics matrix composed of a transparent plastic, comprising a soluble fluorescent dye and a scattering agent whose refractive-index difference from the plastics matrix is +/? from 0.003 to 0.2, characterized in that a white pigment whose refractive-index difference from the plastics matrix is from +0.4 to 1.5 is also present, at a concentration of from 0.001 to 0.1% by weight.Type: GrantFiled: July 25, 2003Date of Patent: March 3, 2009Assignee: Roehm GmbH & Co. KGInventors: Hans Lichtenstein, Guenther Ittmann, Eduard Albrecht
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Publication number: 20070161744Abstract: The invention relates to a polymer solvent binding agent for pigments based on methylmethacrylate. The binding agent is a polymer made of methylmethacrylate and one or several additional radical polymerisierable compounds and is used in the form of a partially polymerised sirup.Type: ApplicationFiled: January 14, 2005Publication date: July 12, 2007Applicant: ROEHM GBMH & CO., KGInventors: Klaus Kabs, Frank Schafer, Hans Lichtenstein, Bernd Klossek
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Publication number: 20060229397Abstract: The invention relates to moulded bodies for illuminated advertising, comprising a poly(meth)acrylate matrix, diffusion particles containing plastic and inorganic diffusion particles. Said moulded bodies contain between 0.05 and 0.5 wt. % diffusion particles containing plastic with a size ranging between 5 and 15 ?m and between 0.1 and 3 wt. % inorganic diffusion particles with a size ranging between 1 and 7.5 ?m.Type: ApplicationFiled: March 2, 2004Publication date: October 12, 2006Applicant: Roehm GMBH & Co. KGInventors: Hans Lichtenstein, Guenther Ittmann
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Patent number: 7052161Abstract: The invention relates to an illuminative device essentionaly comprising a light source and a diffusing cover which is assigned to the light source and is made of colored plastic. The light source consites of one or several light-emitting diodes (LEDs) emitting a colored an substantially monocromatic light. The diffusing cover assigned thereto has a transmition (DIN 5036) of at least 35% and a reflection (DIN 5036) of at least 15% with the wavelength of the light-emitting diode operating at relative maximum energy.Type: GrantFiled: November 21, 2002Date of Patent: May 30, 2006Assignee: ROEHM GmbH & Co. KGInventors: Hans Lichtenstein, Jann Schmidt, Guenther Ittmann, Eduard Albrecht
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Patent number: 7046903Abstract: The present invention relates to a light-guide body, which has at least one light-entry surface and at least one light-exit surface, the ratio of the light-exit surface area to the light-entry surface area being at least 4, comprising at least one light-guiding layer with a thickness of at least 2 mm, characterized in that the light-guiding layer comprises at least 60% by weight, expressed in terms of the weight of the light-guiding layer, of polymethyl methacrylate and from 0.001 to 0.08% by weight, expressed in terms of the weight of the light-guiding layer, of spherical barium sulphate particles with an average diameter in the range of from 0.3 to 20 ?m.Type: GrantFiled: October 16, 2002Date of Patent: May 16, 2006Assignee: Roehm GmbH & Co. KGInventors: Jann Schmidt, Guenther Ittmann, Hans Lichtenstein, Herbert Groothues
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Publication number: 20050288416Abstract: The invention relates to a moulding composed of a plastics matrix composed of a transparent plastic, comprising a soluble fluorescent dye and a scattering agent whose refractive-index difference from the plastics matrix is +/? from 0.003 to 0.2, characterized in that a white pigment whose refractive-index difference from the plastics matrix is from +0.4 to 1.5 is also present, at a concentration of from 0.001 to 0.1% by weight.Type: ApplicationFiled: July 25, 2003Publication date: December 29, 2005Applicant: ROEHM GmbH & Co., KGInventors: Hans Lichtenstein, Guenther Ittmann, Eduard Albrecht
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Publication number: 20050002189Abstract: An illuminative device including a light source and a diffusing cover assigned to the light source and of colored plastic. The light source includes one or plural light-emitting diodes (LEDs) emitting a colored and substantially monochromatic light. The diffusing cover has a transmission of at least 35% (measured according to DIN 5036) and a reflection of at least 15% (measured according to DIN 5036) with the wavelength of the light-emitting diode operating at relative maximum energy.Type: ApplicationFiled: November 21, 2002Publication date: January 6, 2005Inventors: Hans Lichtenstein, Jann Schmidt, Guenther Ittmann, Eduard Albrecht
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Publication number: 20040264159Abstract: The present invention relates to a light-guide body, which has at least one light-entry surface and at least one light-exit surface, the ratio of the light-exit surface area to the light-entry surface area being at least 4, comprising at least one light-guiding layer with a thickness of at least 2 mm, characterized in that the light-guiding layer comprises at least 60% by weight, expressed in terms of the weight of the light-guiding layer, of polymethyl methacrylate and from 0.001 to 0.08% by weight, expressed in terms of the weight of the light-guiding layer, of spherical barium sulphate particles with an average diameter in the range of from 0.3 to 20 &mgr;m.Type: ApplicationFiled: March 11, 2004Publication date: December 30, 2004Inventors: Jann Schmidt, Guenther Ittmann, Hans Lichtenstein, Herbert Groothues
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Patent number: 5621028Abstract: The invention relates to light-scattering polymethacrylate resins with high heat- and weather resistance, which resins may optionally be colored with dyestuffs or pigments. The desirable properties are achieved by addition of a combination of:particles which are light-scattering, and are crosslinked and contain phenyl groups;UV protectants; andradical scavengers.The inventive polymethacrylate molded articles are advantageously employed in illumination technology.Type: GrantFiled: March 3, 1994Date of Patent: April 15, 1997Assignee: Roehm GmbH Chemische FabrikInventors: Hans Lichtenstein, Silvia Ebert
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Patent number: 5449727Abstract: Color concentrates comprising a colorant such as a pigment and a polymeric binder, and polymeric binders therefor, said polymeric binders comprising:(a) 70-90 percent of methyl methacrylate, by weight of the polymer;(b) 10-20 percent of methyl acrylate; and(c) from 0 to 10 percent of at least one free radically polymerizable monomer of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is a moiety carrying a functional group.Type: GrantFiled: September 1, 1993Date of Patent: September 12, 1995Assignee: Rohm GmbHInventors: Manfred Krieg, Hans Lichtenstein, Ludwig Hosch, Guenther Ittmann
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Patent number: 5387634Abstract: Opaque tinted acrylic glass produced with organic pigments or with organic dyes, which in addition to the colorant, also contains an acid in the polymer matrix, exhibits improved resistance to weathering.Type: GrantFiled: January 15, 1993Date of Patent: February 7, 1995Assignee: Roehm GmbH Chemische FabrikInventors: Hans Lichtenstein, Silvia Ebert, Manfred Krieg
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Patent number: 4957987Abstract: Color concentrates comprising a colorant such as a pigment and a polymeric binder and polymeric binders therefor, said polymeric binders comprising:(a) 70-90 percent of methyl methacrylate, by weight of the polymer;(b) 10-20 percent of methyl acrylate; and(c) from 0 to 10 percent of at least one free radically polymerizable monomer of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is a moiety carrying a functonal group.Type: GrantFiled: April 25, 1988Date of Patent: September 18, 1990Assignee: Rohym GmbHInventors: Manfred Krieg, Hans Lichtenstein, Ludwig Hosch, Guenther Ittmann
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Patent number: 4773913Abstract: Color concentrates comprising a colorant such as a pigment and a polymeric binder, and polymeric binders therefor, said polymeric binders comprising:(a) 70-90 percent of methyl methacrylate, by weight of the polymer;(b) 10-20 percent of methyl acrylate; and(c) from 0 to 10 percent of at least one free radically polymerizable monomer of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is a moiety carrying a functional group.Type: GrantFiled: January 2, 1987Date of Patent: September 27, 1988Assignee: Rohm GmbHInventors: Manfred Krieg, Hans Lichtenstein, Ludwig Hosch, Guenther Ittmann