Patents by Inventor Valeri Krongauz
Valeri Krongauz 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: 6891038Abstract: A photochromic compound for incorporation into plastic articles, particularly into a plastic lens, is selected from a spiro(indoline)naphtho(2,1-b)(1,4)oxazine and a spiro(indoline)naphtho(1,2-b)(1,4)oxazine containing a group selected from: (a) —CH2—CnF2n+1 at the nitrogen atom in the 1-position on the indoline part of the molecule, wherein n is an integer of 1 to 6; (b) —COOR at the 3-position on the indoline part of the molecule, wherein R is (i) C1-C6 alkyl optionally substituted by fluoro, C1-C4 alkoxy or fluoroalkoxy, C1-C4 alkylcarbonyloxy, C2-C4 alkenylcarbonyloxy, C3-C6 cycloalkyl or aryl; (ii) C2-C6 alkenyl with a terminal double bond; (iii) C3-C6 cycloalkyl optionally substituted by fluoro; or (iv) aryl; (c) an —OCF3 group on the benzene ring of the indoline part of the molecule; (d) an aryl(dialkyl)methyl group of the formula —C(aryl)(CnH2n+1)(CmH2m+1), wherein n and m are integers from 1 to 5, linked to one of the benzene rings of the naphthoxazine part of the molecule; and (e) any combination ofType: GrantFiled: April 5, 2001Date of Patent: May 10, 2005Assignee: Yeda Research and Development Co. Ltd.Inventors: Valeri Krongauz, Alexandre Chif, Alexander Aizikovich, Vladimir Tchernoivanov
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Patent number: 6627121Abstract: A photochromic naphthopyran of formula (I) wherein R1 through R15, which may be the same or different, are independently selected from the group consisting of hydrogen, C1-C4 alkyl, C1-C4 alkoxy, halogen, C1-C4 alkylcarbonyloxy, benzoyloxy, C3-C6 cycloalkyl, phenyl, and NR16R17, wherein R16 and R17 are each C1-C4 alkyl or together with the N atom form a 5-12 membered monocyclic or polycyclic ring having, optionally, one or more further heteroatoms; R is hydrogen, alkyl or alkoxy; and >C(CnH2n=1) (CmH2m=1) is a tert-alkylene grup, wherein n and m are integers from 1 to 5.Type: GrantFiled: June 10, 2002Date of Patent: September 30, 2003Assignee: Yeda Research and Development Co. Ltd.Inventors: Valeri Krongauz, Emmanuel Lurie, Alexandre Chif, Judith Ratner
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Publication number: 20030114669Abstract: A photochromic compound for incorporation into plastic articles, particularly into a plastic lens, is selected from a spiro(indoline)naphtho(2,1-b) (1,4)oxazine and a spiro(indoline)naphtho(1,2-b) (1,4)oxazine containing a group selected from: (a) —CH2—CnF2n+1 at the nitrogen atom in the 1-position on the indoline part of the molecule, wherein n is an integer of 1 to 6; (b) —COOR at the 3-position on the indoline part of the molecule, wherein R is (i) C1-C6 alkyl optionally substituted by fluoro, C1-C4 alkoxy or fluoroalkoxy, C1-C4 alkylcarbonyloxy, C2-C4 alkenylcarbonyloxy, C3-C6 cycloalkyl or aryl; (ii) C2-C6 alkenyl with a terminal double bond; (iii) C3-C6 cycloalkyl optionally substituted by fluoro; or (iv) aryl; (c) an —OCF3 group on the benzene ring of the indoline part of the molecule; (d) an aryl(dialkyl)methyl group of the formula —C(aryl) (CnH2n+1) (CmH2m+1), wherein n and m are integers from 1 to 5, linked to one of the benzene rings of the naphthoxazineType: ApplicationFiled: September 20, 2002Publication date: June 19, 2003Inventors: Valeri Krongauz, Alexandre Chif, Alexander Aizikovich, Vladimir Tchernoivanov
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Patent number: 5905148Abstract: Polysiloxane copolymers containing both photochromic and lightstabilizing groups with enhanced UV-fatigue resistance can be used as coatings for devices with variable optical density, including lenses, glazing, textiles and the like, to provide light-sensitive darkening effects. The photochromic groups are spironaphtooxazine groups and the lightstabilizing groups are hindered amine light stabilizing (HALS) groups.Type: GrantFiled: August 6, 1997Date of Patent: May 18, 1999Assignee: Yeda Research and Development Co. Ltd.Inventors: Valeri Krongauz, Alexander Zelichonok, Frida Buchholz, Judith Ratner
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Patent number: 5473068Abstract: A method of making a photochromic polysiloxane includes the steps of forming a photochromic spironaphthooxazine monomer including an alkene terminated side and, by addition reaction, covalently bonding the alkene carbon to [SiH] moieties of a siloxane polymer. Novel spironaphthooxazine monomers and photochromic polysiloxanes are disclosed.Type: GrantFiled: February 17, 1994Date of Patent: December 5, 1995Assignee: Yeda Research and Development Co. Ltd. at the Weizmann Institute of ScienceInventors: Valeri Krongauz, Frida Buchhultz, Alexander Zelichenok, Shlomo Yitzchaik
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Patent number: 5434699Abstract: Method for the generation of second order nonlinear optical effects, including second harmonic generation, which comprises the steps of:i preparing a material in an xy planar film or xyz tridimensional form on a substrate and placing parallel electrodes on top of, inside, above or below said material, such that there is no protrusion of said electrodes into said material or a protrusion of at least one of said electrodes into said material is thinner than said material, wherein said material comprises at least one species of a hyperpolarizable component (a) and at least one species of a glass-forming organic material (b) providing a non-crystalline solid matrix in which molecules are not mobile, said components (a) and (b) being either distinct species or portions of a bifunctional molecule;ii subjecting said material of step (i) to an electric field essentially along the x-axis thereof; andiii directing a beam of light to impinge on and to be transmitted through said material treated as in step (ii), thus geType: GrantFiled: March 17, 1994Date of Patent: July 18, 1995Assignee: Yeda Research and Development Co., Ltd.Inventors: Garry Berkovic, Valeri Krongauz, Schlomo Yitzchaik, Shlomo Yitzchaik
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Patent number: 5322945Abstract: A method of making a photochromic polysiloxane includes the steps of forming a photochromic spironaphthooxazine monomer including an alkene terminated side and, by addition reaction, covalently bonding the alkene carbon to [SiH] moieties of a siloxane polymer. Novel spironaphthooxazine monomers and photochromic polysiloxanes are disclosed.Type: GrantFiled: February 19, 1993Date of Patent: June 21, 1994Assignee: Yeda Research and Development Co. Ltd.Inventors: Valeri Krongauz, Frida Buchhultz, Alexander Zelichenok, Shlomo Yitzchaik
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Patent number: 5262890Abstract: In a system and method for generating second order nonlinear optical effects and in particular second order harmonic radiation (SHG), a beam of light is transmitted through and/or reflected from a substance which includes both at least one species selected from amorphous and glassy organic materials and at least one species of hyperpolarizable component, and which is in xy planar film or coating form or in light-transmissive 3-dimensional form and which substance is preferably subjected to a polarizing electric field, such that (a) when the substance is in the form of an xy planar film or coating, the field is applied in the plane of the film and the beam of light is caused to impinge thereon at angle other than normal to the xy plane, (b) when the substance is in 3-dimensional form, the field is applied along a line (an arbitrary x-axis) and the beam of light includes components polarized along at least one of the y- and z-axes; and (c) emergent SHG, which includes at least one component which is polarized pType: GrantFiled: January 23, 1991Date of Patent: November 16, 1993Assignee: Yeda Research and Development Co., Ltd.Inventors: Garry Berkovic, Valeri Krongauz, Schlomo Yitzchaik
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Patent number: 4927917Abstract: There are provided compounds which give quasi-liquid crystals, which comprise a mesogenic group, which can contain bridging groups, a bridging group and a spiropyran moiety having a 2H pyran ring, a terminal group being attached to the mesogenic group. The mesogenic group contains two aromatic, heterocyclic or cycloaliphatic ring structures. The compounds are prepared by a coupling reaction of mesogenic groups with a spiropyran compound via a suitable bridging group. There is provided a process for producing quasi-liquid crystalline (QLC) films which are useful for producing a wide variety of devices based on the optical non-linearity of generation of second harmonics by such films. Such devices can also be based on ferroelectric, pyroelectric, piezoelectric effects and photoactivity of such oriented QLC films.Type: GrantFiled: December 19, 1988Date of Patent: May 22, 1990Assignee: Yeda Research and Development Co., Ltd.Inventors: Valeri A. Krongauz, Felix P. Shvartsman