Patents by Inventor Paul de Groot
Paul de Groot 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: 7082187Abstract: The invention involves a radiological image detection system capable of cooperating with a scanning X-ray generator designed to produce X-ray radiation scanning a surface to be imaged. The scanning X-ray radiation irradiates, portion after portion, the surface to be imaged. The X-ray radiation from a portion carries a radiological image of the portion. The detection system comprises an image sensor which is stationary with respect to the scanning and which is dimensioned so as to be able to acquire an image of the surface to be imaged by the X-ray radiation from the portion. In addition, it comprises a device for limiting, at a given time, the acquisition of the image sensor to that of the image of the portion irradiated at that time.Type: GrantFiled: May 9, 2005Date of Patent: July 25, 2006Assignee: Thales Electron Devices S.A.Inventor: Paul De Groot
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Patent number: 6960879Abstract: The invention relates to the correction of distortion in an image intensifier comprising a primary screen intended for receiving first radiation and a secondary screen that emits second radiation that depends on the first radiation. The image intensifier furthermore includes means for projecting, onto the primary screen, a location test pattern produced using third radiation, and the secondary screen emits an image that depends on the location test pattern.Type: GrantFiled: May 14, 2002Date of Patent: November 1, 2005Assignee: ThalesInventors: Andreas Koch, Michel Codron, Paul De Groot
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Publication number: 20050201518Abstract: The invention involves a radiological image detection system capable of cooperating with a scanning X-ray generator (10) designed to produce X-ray radiation (1) scanning a surface (2) to be imaged. The scanning X-ray radiation (1) irradiates, portion (2?) after portion, the surface (2) to be imaged. The X-ray radiation from a portion (2?) carries a radiological image of said portion. The detection system comprises an image sensor (22, 52) which is stationary with respect to the scanning and which is dimensioned so as to be able to acquire an image of the entire surface (2) to be imaged by the X-ray radiation from the portions (2?). In addition, it comprises means (24, 240) for limiting, at a given time, the acquisition of the image sensor (22, 52) to that of the image of the portion (2?) irradiated at that time, these limitation means being in synchronism with the scanning and in geometrical correspondence with the irradiated portion (2?).Type: ApplicationFiled: May 9, 2005Publication date: September 15, 2005Applicant: THALES ELECTRON DEVICES S.A.Inventor: Paul De Groot
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Patent number: 6934360Abstract: A radiological image detection system capable of cooperating with a scanning X-ray generator designed to produce X-ray radiation scanning a surface to be imaged. The scanning X-ray radiation irradiates, portion after portion, the surface to be imaged. The X-ray radiation from a portion carries a radiological image of the portion. The detection system includes an image sensor that is stationary with respect to the scanning and dimensioned to acquire an image of the entire surface to be imaged by the X-ray radiation from the portions. In addition, the detection system includes a mechanism to limit, at a given time, the acquisition of the image sensor to that of the image of the portion irradiated at that given time, the limitation mechanism being in synchronism with the scanning and in geometrical correspondence with the irradiated portion.Type: GrantFiled: December 28, 2000Date of Patent: August 23, 2005Assignee: Thales Electron Devices S.A.Inventor: Paul De Groot
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Publication number: 20040130629Abstract: The invention relates to the correction of distortion in an image intensifier comprising a primary screen (4) intended for receiving first radiation and a secondary screen (5) that emits second radiation that depends on the first radiation. The image intensifier furthermore includes means (16) for projecting, onto the primary screen (4), a location test pattern (41) produced using third radiation (17), and the secondary screen (5) emits an image that depends on the location test pattern (41).Type: ApplicationFiled: November 3, 2003Publication date: July 8, 2004Inventors: Andreas Koch, Michel Codron, Paul De Groot
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Publication number: 20020172327Abstract: The invention involves a radiological image detection system capable of cooperating with a scanning X-ray generator (10) designed to produce X-ray radiation (1) scanning a surface (2) to be imaged. The scanning X-ray radiation (1) irradiates, portion (2′) after portion, the surface (2) to be imaged. The X-ray radiation from a portion (2′) carries a radiological image of said portion. The detection system comprises an image sensor (22, 52) which is stationary with respect to the scanning and which is dimensioned so as to be able to acquire an image of the entire surface (2) to be imaged by the X-ray radiation from the portions (2′). In addition, it comprises means (24, 240) for limiting, at a given time, the acquisition of the image sensor (22, 52) to that of the image of the portion (2′) irradiated at that time, these limitation means being in synchronism with the scanning and in geometrical correspondence with the irradiated portion (2′).Type: ApplicationFiled: May 9, 2002Publication date: November 21, 2002Inventor: Paul De Groot
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Patent number: 6194700Abstract: To reduce phenomena of distortion in an image intensifier tube, it is planned to provide its input with a permanent test pattern. The image of the test pattern is then read in real time and a deduction is made therefrom of the correction to be made to an image transmitted and converted by this intensifier tube. To create a permanent test pattern, references are made on the intensifier tube, on its input window. As a variant, the references are produced by an auxiliary laser source that illuminates the cathode of the tube by the rear.Type: GrantFiled: April 6, 1999Date of Patent: February 27, 2001Assignee: Thomson Tubes ElectroniquesInventors: Philippe Pradere, Paul de Groot
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Patent number: 5631459Abstract: A device for selecting a remanence of output screens of radiological image intensifier tubes. A luminescent screen (ES1) utilizes two phosphor materials (A, B) exhibiting different remanences and different emission spectra. Wavelength-selective optical filters (Fo) are associated with the luminescent screen ES1 in order to select a remanence chosen by transmitting the corresponding spectral band.Type: GrantFiled: May 12, 1995Date of Patent: May 20, 1997Assignee: Thomson Tubes ElectroniquesInventor: Paul de Groot
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Patent number: 5449449Abstract: Disclosed is a improvement in the fabrication of a scintillator, notably for the input screen of an X-ray image intensifier tube. According to the disclosure, the substrate on which a layer of scintillating material such as cesium iodide deposited in is made to grow is subjected to a treatment resulting in the formation of an alveolate structure or surface state, the consequence of which is the formation of thinner needles. The reduction of the mean diameter of the needles results in a improvement of the resolution of the device.Type: GrantFiled: December 28, 1994Date of Patent: September 12, 1995Assignee: Thomson-CSFInventors: Gerard Vieux, Paul De Groot
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Patent number: 5338927Abstract: The disclosure relates to image intensifier tubes of the proximity focusing type, wherein it especially concerns the positioning of a primary screen with respect to a slab of microchannels. An image intensifier tube comprises a sealed chamber containing a primary screen and a slab of microchannels. The slab of microchannels is fixed to the body of the chamber. According to one characteristic, the primary screen is fixed to the slab, from which it is kept at a distance by means of at least one insulating shim. The result thereof is greater precision and greater uniformity of the spacing between the primary screen and the slab of microchannels.Type: GrantFiled: January 29, 1993Date of Patent: August 16, 1994Assignee: Thomson Tube ElectroniquesInventors: Paul de Groot, Yves Beauvais
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Patent number: 5319189Abstract: An X-ray image intensifier tube includes a scintillator screen for converting ionizing radiation into light radiation or near-visible radiation, a microchannel array for achieving electron multiplication, and a photoelectrode positioned directly on an input face of the microchannel array. The input face of the microchannel array is coated with an electrically conductive layer which directly contacts the photocathode. The present design eliminates strict spacing requirements between the photocathode and the microchannel array and allows the photocathode and the microchannel array to operate at a single potential rather than requiring separate potentials. The requirement of a separate support for the scintillator screen is also obviated since the scintillator screen is formed on the input face of the microchannel array.Type: GrantFiled: February 23, 1993Date of Patent: June 7, 1994Assignee: Thomson Tubes ElectroniquesInventors: Yves Beauvais, Paul de Groot
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Patent number: 5298294Abstract: An input screen scintillator for an X-ray image intensifier tube. The tube includes light conductive cesium iodide needles formed on an electrically conductive substrate. Each needle is entirely coated with a material such as a metal or a semiconductor which reflects the light travelling within the needle toward the inside of the needle. This coating can enhance the efficiency and resolution of the image intensifier tube.Type: GrantFiled: May 24, 1993Date of Patent: March 29, 1994Assignee: Thomson-CSFInventors: Gerard Vieux, Henri Rougeot, Paul de Groot, Francois Chareyre
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Patent number: 4980561Abstract: The invention concerns an input screen scintillator for an X-ray image intensifier tube. This tube comprises light-conductive cesium iodide needles formed on an electrically conductive substrate. According to the invention, each needle is entirely coated with a material such as a metal or a semiconductor which reflects the light travelling within the needles and allows an identical potential level in the coating material as in the substrate towards the inside of said needles. The coating can enhance the efficiency and resolution of image intensifier tubes. The invention has applications in the field of X-ray imagery.Type: GrantFiled: January 10, 1989Date of Patent: December 25, 1990Assignee: Thomson-CSFInventors: Gerard Vieux, Henri Rougeot, Paul de Groot, Francois Chareyre
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Patent number: 4960608Abstract: The invention concerns a manufacturing process of a photocathode for an image intensifier tube.According to this process, the photocathode is made within the tube by depositing a photoelectric material on a conductive substrate by vacuum evaporation. During this operation, the optical transparency of the deposit is checked by illumination of this deposit by a light source. According to the invention, this light source is located within the tube and is protected from the vapors of the photoelectric material. In the prior art, this light source was located outside the tube and the illumination of the deposit was not sufficient.The invention has applications in the field of image intensifier tubes.Type: GrantFiled: January 12, 1989Date of Patent: October 2, 1990Assignee: Thomson-CSFInventors: Gerard Vieux, Daniel Boisson, Paul de Groot, Gilbert-Rene Colomb
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Patent number: 4943254Abstract: Disclosed is a method for the fabrication of an X-ray image intensifier tube. Before being introduced into the X-ray image intensifier, one of all the electrodes are entirely or partially covered with a layer of an orgainc polymer which is an electronic conductor of electricity and which has the property of reacting chemically with the alkaline metals deposited on the electrodes. Thus, the spurious illumination of the observation screen, due to the alkaline metals deposited on the electrodes during the preparation of the photocathode, is eliminated.Type: GrantFiled: July 6, 1989Date of Patent: July 24, 1990Assignee: Thomson-CSFInventors: Garard Vieux, Francis Diaz, Paul de Groot
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Patent number: 4829355Abstract: A photocathode having internal amplification includes a first electrode adapted for receiving a first voltage, and for transmitting received photons. An absorption layer is disposed adjacent the first electrode and comprises a P-type semiconductor material having a forbidden band of sufficiently small width to cause photons received through said first electrode to be converted into electron-hole pairs. At least one ionization-induced electron multiplication layer is disposed adjacent the absorption layer. Each such multiplication layer comprises two layers of N-type semiconductor material having respectively two different compositions at an interface therebetween. The two different compositions at the interface cause the multiplication layer, when biased, to accelerate the electrons received from the absorption layer to a degree greater than the acceleration provided to the holes received from the absorption layer.Type: GrantFiled: December 17, 1986Date of Patent: May 9, 1989Assignee: Thomson-CSFInventors: Bernard Munier, Paul de Groot, Claude Weisbuch, Guy Moiroud, Yves Henry
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Patent number: 4751423Abstract: A photocathode having a low dark current comprises a first layer consisting of P.sup.+ type semiconductor material which is transparent to all wavelengths of the light to be detected, a second layer consisting of P.sup.Type: GrantFiled: November 24, 1986Date of Patent: June 14, 1988Assignee: Thomson CSFInventors: Bernard Munter, Paul de Groot, Claude Weisbuch, Yves Henry
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Patent number: 4749903Abstract: In one example of construction, a high-performance photocathode has the following structure:a transparent layer formed of P.sup.+ type semiconductor material having a forbidden band of sufficient width to ensure that this layer is transparent to the photons of the light to be detected;an absorption layer constituted by ten first sublayers formed of P.sup.Type: GrantFiled: November 24, 1986Date of Patent: June 7, 1988Assignee: Thomson CSFInventors: Bernard Munier, Paul de Groot, Claude Weibuch, Yves Henry