Patents by Inventor Todor I. Donchev
Todor I. Donchev 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).
-
Publication number: 20120017415Abstract: A method for using a reusable sample-holding device for readily loading very small wet samples for observation of the samples by microscopic equipment, in particular in a vacuum environment. The method may be used with a scanning electron microscope (SEM), a transmission electron microscope (TEM), an X-ray microscope, optical microscope, and the like. For observation of the sample, the method provides a thin-membrane window etched in the center of each of two silicon wafers abutting to contain the sample in a small uniform gap formed between the windows. This gap may be adjusted by employing spacers. Alternatively, the thickness of a film established by the fluid in which the sample is incorporated determines the gap without need of a spacer. To optimize resolution each window may have a thickness on the order of 50 nm and the gap may be on the order of 50 nm.Type: ApplicationFiled: September 22, 2011Publication date: January 26, 2012Inventors: Charles P. MARSH, Eric OLSON, Todor I. DONCHEV, Ivan PETROV, Jianguo WEN, Ryan FRANKS, Dongxiang LIAO
-
Patent number: 8102523Abstract: A method for using a reusable sample-holding device for readily loading very small wet samples for observation of the samples by microscopic equipment, in particular in a vacuum environment. The method may be used with a scanning electron microscope (SEM), a transmission electron microscope (TEM), an X-ray microscope, optical microscope, and the like. For observation of the sample, the method provides a thin-membrane window etched in the center of each of two silicon wafers abutting to contain the sample in a small uniform gap formed between the windows. This gap may be adjusted by employing spacers. Alternatively, the thickness of a film established by the fluid in which the sample is incorporated determines the gap without need of a spacer. To optimize resolution each window may have a thickness on the order of 50 nm and the gap may be on the order of 50 nm.Type: GrantFiled: September 22, 2011Date of Patent: January 24, 2012Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Charles P. Marsh, Eric Olson, Todor I. Donchev, Ivan Petrov, Jianguo Wen, Ryan Franks, Dongxiang Liao
-
Patent number: 8059271Abstract: A reusable sample-holding device for readily loading very small wet samples for observation of the samples by microscopic equipment, in particular in a vacuum environment. Embodiments may be used with a scanning electron microscope (SEM), a transmission electron microscope (TEM), an X-ray microscope, optical microscope, and the like. For observation of the sample, embodiments provide a thin-membrane window etched in the center of each of two silicon wafers abutting to contain the sample in a small uniform gap formed between the windows. This gap may be adjusted by employing spacers. Alternatively, the thickness of a film established by the fluid in which the sample is incorporated determines the gap without need of a spacer. To optimize resolution each window may have a thickness on the order of 50 nm and the gap may be on the order of 50 nm.Type: GrantFiled: February 4, 2009Date of Patent: November 15, 2011Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Charles P. Marsh, Eric Olson, Todor I. Donchev, Ivan Petrov, Jianguo Wen, Ryan Franks, Dongxiang Liao
-
Patent number: 7951276Abstract: Described herein is an apparatus and a method for producing atom clusters based on a gas discharge within a hollow cathode. The hollow cathode includes one or more walls. The one or more walls define a sputtering chamber within the hollow cathode and include a material to be sputtered. A hollow anode is positioned at an end of the sputtering chamber, and atom clusters are formed when a gas discharge is generated between the hollow anode and the hollow cathode.Type: GrantFiled: June 7, 2007Date of Patent: May 31, 2011Assignee: The Board of Trustees of the University of IllinoisInventors: Todor I. Donchev, Ivan G. Petrov
-
Patent number: 7884326Abstract: A manipulator for use in e.g. a Transmission Electron Microscope (TEM) is described, said manipulator capable of rotating and translating a sample holder (4). The manipulator clasps the round sample holder between two members (3A, 3B), said members mounted on actuators (2A, 2B). Moving the actuators in the same direction results in a translation of the sample holder, while moving the actuators in opposite directions results in a rotation of the sample holder.Type: GrantFiled: September 26, 2007Date of Patent: February 8, 2011Assignees: FEI Company, The Board of Trustees of the University of Illinois, The Regents of the University of CaliforniaInventors: Jeroen van de Water, Johannes van den Oetelaar, Raymond Wagner, Hendrik Nicolaas Slingerland, Jan Willem Bruggers, Adriaan Huibert Dirk Ottevanger, Andreas Schmid, Eric A. Olson, Ivan G. Petrov, Todor I. Donchev, Thomas Duden
-
Patent number: 7800063Abstract: A manipulator for use in e.g. a Transmission Electron Microscope (TEM) is described, said manipulator capable of rotating and translating a sample holder (4). The manipulator clasps the round sample holder between two members (3A, 3B), said members mounted on actuators (2A, 2B). Moving the actuators in the same direction results in a translation of the sample holder, while moving the actuators in opposite directions results in a rotation of the sample holder.Type: GrantFiled: September 26, 2007Date of Patent: September 21, 2010Assignees: FEI Company, The Board of Trustees of the University of Illinois, The Regents of the University of CaliforniaInventors: Jeroen van de Water, Johannes van den Oetelaar, Raymond Wagner, Hendrik Nicolaas Slingerland, Jan Willem Bruggers, Adriaan Huibert Dirk Ottevanger, Andreas Schmid, Eric A. Olson, Ivan G. Petrov, Todor I. Donchev, Thomas Duden
-
Publication number: 20100193398Abstract: A reusable sample-holding device for readily loading very small wet samples for observation of the samples by microscopic equipment, in particular in a vacuum environment. Embodiments may be used with a scanning electron microscope (SEM), a transmission electron microscope (TEM), an X-ray microscope, optical microscope, and the like. For observation of the sample, embodiments provide a thin-membrane window etched in the center of each of two silicon wafers abutting to contain the sample in a small uniform gap formed between the windows. This gap may be adjusted by employing spacers. Alternatively, the thickness of a film established by the fluid in which the sample is incorporated determines the gap without need of a spacer. To optimize resolution each window may have a thickness on the order of 50 nm and the gap may be on the order of 50 nm.Type: ApplicationFiled: February 4, 2009Publication date: August 5, 2010Inventors: CHARLES P. MARSH, ERIC OLSON, TODOR I. DONCHEV, IVAN PETROV, JIANGUO WEN, RYAN FRANKS, DONGXIANG LIAO
-
Patent number: 7706506Abstract: A system for irradiating material used in transfusions. The material can be pre-transfused blood, blood components and marrow. The system includes a vacuum chamber with a plate cathode inside. The cathode has a large beam electrode field-electron emissive surface with a selected cross-sectional shaped area. A power supply is connected to the cathode for generating negative high-voltage pulses and causing a selected cross-sectional shaped beam of electrons to be emitted. An electron window is also disposed inside the vacuum chamber and made of thin metal foil. The electron window receives the selected cross-sectional shaped beam of electrons therethrough and onto an electron target disposed outside the vacuum chamber. The electron target receives the selected cross-sectional shaped beam of electrons thereon and generates a selected cross-sectional shaped X-ray beam. A cathode filter is disposed next to the electron target and eliminates low energy beams from the spectrum of the X-ray beam.Type: GrantFiled: December 12, 2008Date of Patent: April 27, 2010Assignee: Applied X-Rad Technology, LLCInventors: Ralph R. Woodruff, Stoyan A. Toshkov, Todor I. Donchev
-
Publication number: 20090255802Abstract: Described herein is an apparatus and a method for producing atom clusters based on a gas discharge within a hollow cathode. The hollow cathode includes one or more walls. The one or more walls define a sputtering chamber within the hollow cathode and include a material to be sputtered. A hollow anode is positioned at an end of the sputtering chamber, and atom clusters are formed when a gas discharge is generated between the hollow anode and the hollow cathode.Type: ApplicationFiled: June 7, 2007Publication date: October 15, 2009Inventors: Todor I. Donchev, Ivan G. Petrov
-
Publication number: 20080173813Abstract: A manipulator for use in e.g. a Transmission Electron Microscope (TEM) is described, said manipulator capable of rotating and translating a sample holder (4). The manipulator clasps the round sample holder between two members (3A, 3B), said members mounted on actuators (2A, 2B). Moving the actuators in the same direction results in a translation of the sample holder, while moving the actuators in opposite directions results in a rotation of the sample holder.Type: ApplicationFiled: September 26, 2007Publication date: July 24, 2008Applicants: FEI COMPANY, THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: JEROEN VAN DE WATER, JOHANNES VAN DEN OETELAAR, RAYMOND WAGNER, HENDRIK NICOLAAS SLINGERLAND, ANDREAS SCHMID, IVAN G. PETROV, TODOR I. DONCHEV, ERIC A. OLSON, JAN WILLEM BRUGGERS, ADRIAAN HUIBERT DIRK OTTEVANGER, THOMAS DUDEN