Patents Assigned to Institute Jozef Stefan
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Patent number: 10322001Abstract: The present invention relates to an implant having a multilayered coating comprising a porous titanium-based layer on the implant, an optional interface titania layer on and/or in the porous titanium-based layer and a bioactive glass layer on and/or in the porous structure formed by the titanium-based and titania layer(s); as well as to a process for preparing an implant having a multilayered coating.Type: GrantFiled: April 13, 2011Date of Patent: June 18, 2019Assignee: Institut Jozef StefanInventors: Sasa Novak Krmpotic, Natasa Drnovsek, Gregor Murn
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Patent number: 9589631Abstract: The invention refers to an ultrafast quench based nonvolatile bistable device which consists of an active material on a passive or active substrate which changes its physical properties, after exposure to a sufficiently temporally short external perturbation causing an ultrafast quench. The perturbation can be from an external ultrashort laser pulse or ultrafast electrical pulse from an electrooptic device or any other generator of ultrashort pulses. This change of the materials properties can be detected as a change of optical properties or electrical resistance. The dielectric properties can be reverted back to their original state by the application of a heat pulse applied by an electrical heater within the device or an external laser.Type: GrantFiled: September 30, 2013Date of Patent: March 7, 2017Assignee: Institut “Jozef Stefan”Inventors: Ljupka Stojcevska, Tomaz Mertelj, Igor Vaskivskyi, Dragan Mihailovic
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Patent number: 9263843Abstract: The patent refers to one or more droplets of chiral liquid crystals used as point source(s) of laser light. The source is shaped as a droplet of chiral liquid crystals (1) and an active medium preferably dispersed in the liquid crystals. The source is spherical and with a size of preferably between a few nanometres and 100 micrometres. A droplet consists of chiral liquid crystals (1) that have selective reflection in the range of the active medium's emission and can be cholesteric liquid crystals, a mixture of nematic liquid crystals and a chiral dopant or any other chiral liquid-crystal phase, preferably the blue phase, the ferroelectric phase, the antiferroelectric phase, any of the ferrielectric phases or another chiral phase of a soft substance, that need not be chiral by itself.Type: GrantFiled: November 8, 2011Date of Patent: February 16, 2016Assignee: INSTITUT JOZEF STEFANInventors: Igor Musevic, Matjaz Humar
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Patent number: 9151724Abstract: The invention refers to a method and capacitive sensor for counting aerosol nanoparticles in an electric way. Aerosol particles, onto which a fluid was applied in an earlier process by known methods, change the capacitance of the dielectric of the capacitor when entering its field, which causes an electric signal. The method provides for detection of aerosol particles in a wide scope of their presence in the air and is not specific for any shape or chemical composition of nanoparticles.Type: GrantFiled: October 8, 2009Date of Patent: October 6, 2015Assignee: Institute Jozef StefanInventors: Maja Remskar, Ivan Iskra, Marko Virsek, Mark Plesko, Damjan Golob
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Patent number: 8754198Abstract: The present invention relates to microorganisms that express, or have attached to their surface, a TNF? binding polypeptide. Peptides expressed or attached on the surface of microorganism are more resistant to chemical and enzymatic degradation in the gastrointestinal tract. Such microorganisms are capable of binding TNF? and therefore reducing the content of free TNF? and alleviating its pro-inflammatory effects in the gut. The invention also relates to the use of such microorganisms as medicament in the treatment of inflammatory bowel disease.Type: GrantFiled: January 5, 2011Date of Patent: June 17, 2014Assignees: University of Ljubljana, Institute Jozef Stefan, Labena d.o.o.Inventors: Mojca Lunder, Matjaz Ravnikar, Borut Strukelj, Ales Berlec, Boris Ceh
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Patent number: 8542334Abstract: A new concept of the LCD light-switching optical filter allowing for very high, electrically controlled, continuously variable light attenuation (up to ?100,000) optimized/symmetrized for the light incidence along the normal to the LCD plane is proposed. The new LCD light-switching optical filter also exhibits very low light attenuation dependence for the oblique incidence of light within a limited cone of angles off the normal incidence direction in compliance with the international safety and quality regulation EN 379 for personal protection equipment. According to the invention the problem is solved by specific, novel modification of the general principle of highly twisted nematic LCDs, allowing for the adaptation of the light transmission/driving voltage characteristics to specific requirements of the driving electronics as well as “symmetrizing” the overall optical birefringent properties, which in turn results in a high degree of their angular compensation.Type: GrantFiled: August 12, 2011Date of Patent: September 24, 2013Assignee: Institut Jozef StefanInventors: Janez Pirs, Matej Bazec, Silvija Pirs, Bojan Marin, Bernarda Urankar, Dusan Ponikvar
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Publication number: 20130223467Abstract: The patent refers to one or more droplets of chiral liquid crystals used as point source(s) of laser light. The source is shaped as a droplet of chiral liquid crystals (1) and an active medium preferably dispersed in the liquid crystals. The source is spherical and with a size of preferably between a few nanometres and 100 micrometres. A droplet consists of chiral liquid crystals (1) that have selective reflection in the range of the active medium's emission and can be cholesteric liquid crystals, a mixture of nematic liquid crystals and a chiral dopant or any other chiral liquid-crystal phase, preferably the blue phase, the ferroelectric phase, the antiferroelectric phase, any of the ferrielectric phases or another chiral phase of a soft substance, that need not be chiral by itself.Type: ApplicationFiled: November 8, 2011Publication date: August 29, 2013Applicant: INSTITUT JOZEF STEFANInventors: Igor Musevic, Matjaz Humar
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Patent number: 8496907Abstract: The object of the invention is the synthesis of threadlike tungsten oxide W5O14, in the presence of nickel at a temperature lower than 1000° C. Represented is a procedure for the synthesis of a highly homogeneous phase of the W5O14 compound from the vapor phase, in the presence of nickel, by means of a chemical transport method in a closed quartz ampoule. As an alternative example, a procedure is represented for the synthesis of the W5O14 compound in a through-flow reaction vessel. Both procedures yield electrically conductive threadlike crystals of the W5O14 compound. The synthesis is performed in vapor phase. Tungsten enters the reaction as a pure phase or via WS2±x, x?4, previously synthesized from the elements, and/or the source of tungsten may also be tungsten oxides WO3?Y, 0?y?1. Nickel may enter the reaction via NiI2, Ni(OH)2 and/or atomic nickel.Type: GrantFiled: February 22, 2008Date of Patent: July 30, 2013Assignee: Institut “Jozef Stefan”Inventors: Maja Remskar, Marko Virsek, Miha Kocmur, Adolf Jesih
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Patent number: 7800376Abstract: A method and a device for measuring ultrahigh vacuum are disclosed. The method includes providing a vacuum cold cathode pressure gauge and varying a voltage on an anode of the pressure cell with pressure in such a way that an ion current flow is maintained substantially at its maximum value at all times. A voltage-controlled source either (1) preliminarily scans a whole voltage range, for example, between 1 kV and 12 kV, in a relatively short time, and subsequently sets the source to the voltage, at which the current is substantially at its maximum value or (2) based on a calibration of the gauge, sets the voltage, for a given pressure, to the value that has been previously stored as substantially optimal. The device operates at a voltage that varies with pressure in such a way that the ion current is maintained substantially at its maximum value at all times.Type: GrantFiled: January 26, 2005Date of Patent: September 21, 2010Assignee: Institut “Jozef Stefan”Inventors: Alenka Vesel, Miran Mozetic
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Publication number: 20100129285Abstract: The object of the invention is a process for the synthesis of nanotubes of transition metal dichalcogenides, of fullerene-like nanostructures of transition metal dichalcogenides, of nanotubes of transition metal dichalcogenides, filled with fullerene-like nanostructures of transition metal dichalcogenides, of quasi one-dimensional structures (nanowires, microwires and ribbons) of transition metal oxides and of quasi one-dimensional structures of transition metal dichalcogenides, consisting of fine crystallites of transition metal dichalcogenides. The process is characterized in that the synthesis occurs by the chemical transformation of quasi one-dimensional compounds with a sub-micron diameter, described by the formula M6CyH2, 8.2<y+z<10, where M is a transition metal (Mo, W, Ta, Nb), C is a chalcogen (S, Se, Te), H is a halogen (I).Type: ApplicationFiled: March 28, 2008Publication date: May 27, 2010Applicant: INSTITUT JOZEF STEFANInventors: Ales Mrzel, Maja Remskar, Adolf Jesih, Marko Virsek
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Patent number: 7420631Abstract: A new concept of the normally open LCD light switching element is proposed, which allows for the superior angular compensation for the light attenuation by using a single simple negative bireffingent c-plate compensation layer. The concept is based on the simultaneous use of highly angularly symmetric STN LC-configuration (preferably 180° twist) and maximal use of the single (preferably ordinary ray) light propagation mode. The solution is best suitable for various light switching applications like LCD automatic protective welding light filters, as well as for multi-segment large display panels, where it provides for excellent uniformity of the light-attenuation in the “dark” state.Type: GrantFiled: April 14, 2004Date of Patent: September 2, 2008Assignee: Institut Jozef StefanInventors: Janez Pirs, Matej Bazec, Silvija Pirs, Bojan Marin, Andrej Vrecko
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Patent number: 7368906Abstract: The present invention relates to a measuring tool for measuring magnetic properties of a magnetic sample in a closed loop, comprising an electromagnet in a closed loop arrangement with two pole pieces connected to a yoke, said pole pieces forming a gap for the placement of the sample, a search coil for the measurement of a flux density B of the sample and a magnetic field sensor for the measurement of a magnetic field strength H in the gap between said pole pieces. The pole pieces comprise heater elements for heating the pole pieces to temperatures of at least 400° C. and are thermally insulated against the yoke of the electromagnet. The pole pieces, the search coil and the magnetic field sensor are made of materials which resist said high temperatures. The measuring tool allows the non-destructive measurement of magnetic properties of magnetic samples in closed circle up to 500° C.Type: GrantFiled: October 7, 2003Date of Patent: May 6, 2008Assignee: Institute Jozef StefanInventors: Paul John McGuiness, Gregor Gersak, Spomenke Kobe
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Publication number: 20070216404Abstract: The present invention relates to a measuring tool for measuring magnetic properties of a magnetic sample in a closed loop, comprising an electromagnet (1) in a closed loop arrangement with two pole pieces (3) connected to a yoke (2), said pole pieces (3) forming a gap (4) for the placement of the sample (5), a search coil (6) for the measurement of a flux density B of the sample (5) and a magnetic field sensor (7) for the measurement of a magnetic field strength H in the gap (4) between said pole pieces (3). The pole pieces (3) comprise heater elements (8) for heating the pole pieces (3) to temperatures of at least 4000 C and are thermally insulated against the yoke (2) of the electromagnet (1). The pole pieces (3), the search coil (6) and the magnetic field sensor (7) are made of materials which resist said high temperatures. The measuring tool allows the non-destructive measurement of magnetic properties of magnetic samples in closed circle up to 500° C.Type: ApplicationFiled: October 7, 2003Publication date: September 20, 2007Applicant: Institute Jozef StefanInventors: Paul McGuiness, Gregor Gersak, Spomenka Kobe
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Patent number: 7132133Abstract: This invention solves the technical problem of compensating for the angular dependence of the contrast in optical devices comprising liquid crystal displays (LC optical light shutters, which operate on the principle of electrically controlled optical birefringence), with the aid of a compensation layer exhibiting optically negative birefringence, which enables the angular compensation of the LC layer birefringence in the state in which the LC molecules are homeotropically aligned (typical optically positive birefringence). The process for the manufacture of the optically negatively birefringent compensation layer is devised on the controlled spontaneous deformation of the polymer molecules during the polymerization procedure. The manufacturing process is feasible by the employment of known and well-controllable technical procedures, and enables the mass production of compensation layers.Type: GrantFiled: June 12, 2000Date of Patent: November 7, 2006Assignee: Institut Jozef StefanInventors: Janez Pir{hacek over (s)}, Silva Pir{hacek over (s)}, Bojan Marin, Robert Blinc, Martin Copic, Rok Petkov{hacek over (s)}ek
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Patent number: 6781725Abstract: The present invention relates to a method and a system for the storage of data in the form of volume holograms which do not mutually overlap. The storage medium consists of a high-sensitive material in the form of a plate of thickness D, in which a single hologram is essentially shaped as a cylinder with the minimal possible cross-section. The signal light beam is modulated with data and directed onto the plate-shaped storage material by means of a lens or a conventional optical system, illuminating an area of the material which, for a given amount of data, is the smallest possible. To record a hologram, a reference light beam is used, incident upon the storage material either from the same direction as the signal beam, or opposite thereto. The hologram is only written in the portion where the signal and the reference beams overlap.Type: GrantFiled: February 19, 2003Date of Patent: August 24, 2004Assignee: Institut “Jozef Stefan”Inventor: Marko Zgonik