Patents by Inventor Richard E. Thomas
Richard E. Thomas 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: 20090078188Abstract: A retractable boat ladder, having: a first support; a pair of second supports; a step frame connected to the first support and the pair of second supports such that the step frame rotates from a retracted position through an intermediate locking position to a fully extended position; and a locking mechanism on at least one of the second supports, the locking mechanism holding the second support is an intermediate locked position when the second support has been rotated from a retracted position to the intermediate locked position, and releasing the second support from the intermediate locked position when the second support has been rotated from the intermediate locked position to a fully extended position.Type: ApplicationFiled: September 21, 2007Publication date: March 26, 2009Inventor: Richard E. Thomas
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Patent number: 5808059Abstract: The invention relates to the field of polymer- and other matrix-supported sapphyrins. Disclosed are silica gel, glass, resin and other polymer- and matrix-supported sapphyrins and sapphyrin-containing chromatographic and electrophoretic supports.Type: GrantFiled: August 28, 1995Date of Patent: September 15, 1998Assignee: Board of Regents, University of Texas SystemInventors: Jonathan L. Sessler, Brent L. Iverson, Vladimir Kral, Kevin Shreder, Hiroyuki Furuta, Richard E. Thomas
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Patent number: 5744302Abstract: The present invention provides various novel covalently modified sapphyrin derivatives and conjugates; polymers including sapphyrin or derivatives thereof; and chromatographic supports including sapphyrins and other expanded porphyrins and derivatives thereof. Disclosed are water soluble sapphyrins, including polyhydroxysapphyrins and sapphyrin-sugar derivatives; sapphyrin-metal chelating conjugates; sapphyrin nucleobase conjugates; oligosapphyrins and polysapphyrins, including sapphyrin dimers, trimers, oligomers and higher polymers; and polymer supported expanded porphyrin compositions, including advantageous rubyrin- and sapphyrin-based chromatography columns and electrophoretic supports. Sapphyrin oligomers and polymers and polymer supported expanded porphyrins, such as, e.g.Type: GrantFiled: May 11, 1995Date of Patent: April 28, 1998Assignee: Board of Regents, The University of Texas SystemInventors: Jonathan L. Sessler, Brent L. Iverson, Vladimir Kral, Kevin Shreder, Hiroyuki Furuta, Richard E. Thomas
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Patent number: 5672490Abstract: The present invention provides various novel covalently modified sapphyrin derivatives and conjugates; polymers including sapphyrin or derivatives thereof; and chromatographic supports including sapphyrins and other expanded porphyrins and derivatives thereof. Disclosed are water soluble sapphyrins, including polyhydroxysapphyrins and sapphyrin-sugar derivatives; sapphyrin-metal chelating conjugates; sapphyrin nucleobase conjugates; oligosapphyrins and polysapphyrins, including sapphyrin dimers, trimers, oligomers and higher polymers; and polymer supported expanded porphyrin compositions, including advantageous rubyrin- and sapphyrin-based chromatography columns and electrophoretic supports. Sapphyrin oligomers and polymers and polymer supported expanded porphyrins, such as, e.g.Type: GrantFiled: June 2, 1995Date of Patent: September 30, 1997Assignee: The University of Texas Board of RegentsInventors: Jonathan L. Sessler, Brent L. Iverson, Vladimir Kral, Kevin Shreder, Hiroyuki Furuta, Richard E. Thomas
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Patent number: 5594136Abstract: The present invention provides various novel matrix-supported texaphyrins in which a polymeric or solid matrix is covalently modified by the addition of one or more texaphyrins or texaphyrin derivatives. Described are methods of making various polymer-supported texaphyrins, including texaphyrin chromatographic supports, and devices such as catheters, as may be used, for example, in the separation of neutral and anionic species and in applications concerning phosphate ester hydrolysis, other catalytic schemes, MRI, and PDT.Type: GrantFiled: May 3, 1995Date of Patent: January 14, 1997Assignees: Pharmacyclics, Inc., Board of Regents, The University of TexasInventors: Jonathan L. Sessler, Brent L. Iverson, Vladimir Kr al, Richard E. Thomas, Darren Magda, Daniel A. Smith
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Patent number: 5336993Abstract: A test assembly for testing regulators and rectifiers. The assembly includes two main components: a modified alternator and a test board. The test board has a regulator test station, which is electrically connected to the rotor of the modified alternator, and it has a rectifier test station, which is electrically connected to the stator of the modified alternator. The modified alternator is run on a conventional alternator tester and its meter observed. This testing assembly allows regulators and rectifiers to be tested individually at a high amperage (full load) before they are assembled into an alternator.Type: GrantFiled: September 9, 1992Date of Patent: August 9, 1994Inventors: Richard E. Thomas, Arthur R. Besozzi
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Patent number: 4745326Abstract: A controlled porosity dispenser cathode and method of manufacture therefo using chemical vapor deposition and laser drilling, ion milling, or electron discharge machining for consistent and economical manufacturing a cathode with pores on the order of 0.2 to 2 .mu.m in diameter.Type: GrantFiled: December 10, 1986Date of Patent: May 17, 1988Assignee: The United States of America as represented by the Secretary of the NavyInventors: Richard F. Greene, Richard E. Thomas
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Patent number: 4675091Abstract: A thermionic cathode fabricated by cosputtering alkaline earth oxide and al powders under temperature and pressure conditions that ensure a metal particle size in a preferred range.Type: GrantFiled: April 16, 1986Date of Patent: June 23, 1987Assignee: United States of America as represented by the Secretary of the NavyInventors: Richard E. Thomas, Victor H. Ritz
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Patent number: 4379979Abstract: A controlled porosity sheet defining a surface for a thermionic dispenser thode and a method of manufacture. Starting with a generally flat silicon template substrate structure having an array of upstanding microposts 1-25 microns across on 5-100 micron spacings from each other, a layer of metal is deposited on the substrate to surround the microposts and cover the substrate structure to a desired depth. The metal layer is then abraded to a smooth, flat surface which exposes the microposts. Thereafter, the silicon substrate and microposts are completely etched away, leaving a metal sheet having micron-size holes therethrough.Type: GrantFiled: February 6, 1981Date of Patent: April 12, 1983Assignee: The United States of America as represented by the Secretary of the NavyInventors: Richard E. Thomas, Richard F. Greene
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Patent number: 4371809Abstract: In a controlled-porosity dispenser cathode of the type which has a foil w a plurality of holes covering the emitting material so that emitting material is dispensed through the holes to the electron-emitting surface of the foil and electrons are actually emitted through the holes and a small area surrounding each hole, a non-emitting shadow grid is laid down on the surface of the foil in such a configuration that it does not obstruct any of the emitting holes, has the same shape as the control grid, and is substantially in precise registration with the control grid.Type: GrantFiled: June 19, 1980Date of Patent: February 1, 1983Assignee: The United States of America as represented by the Secretary of the NavyInventors: Richard E. Thomas, George A. Haas, Richard F. Greene
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Patent number: 4254357Abstract: A multi-arrayed electron emitter for microwave tubes in which the emitting urface is an array of continually replenished low-work-function regions, (micro-patches), whose boundaries include a control grid which is integral with the cathode surface and which controls emission from the low-work-function micro-patches. The continually replenished low-work-function regions are uniformly positioned relative to a matrix of uniformly spaced openings through which the low-work-function material is released.Type: GrantFiled: September 14, 1979Date of Patent: March 3, 1981Assignee: The United States of America as represented by the Secretary of the NavyInventors: George A. Haas, Richard E. Thomas, Richard F. Greene
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Patent number: 4242462Abstract: An electrically powered self-heating inoculating loop, including an inoculating loop capable of being heated by passing an electrical current through the loop, and a means for introducing and regulating the electrical current to said inoculating loop.Type: GrantFiled: March 16, 1979Date of Patent: December 30, 1980Inventor: Richard E. Thomas
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Patent number: 4144488Abstract: An electron-beam scanning system for investigating the nonuniformity of (1) he work function, (2) the position of the conduction-band edge with respect to the Fermi level, and (3) the electron affinity at the surface of a single-crystal semiconductor. A small-diameter, low-energy electron beam is scanned over the surface to be investigated. The current collected by the surface for electron energies in the retarding-field region is related to the work function of the surface, whereas the current collected by the surface for electron energies in the accelerating-field region is related to the position of the conduction-band edge. The electron affinity is related to the combination of these relationships. Variations in the current collected by the surface for appropriately selected electron energies are used to provide a visual display of variations in these quantities.Type: GrantFiled: December 22, 1977Date of Patent: March 13, 1979Assignee: The United States of America as represented by the Secretary of the NavyInventors: George A. Haas, Arnold Shih, Richard E. Thomas
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Patent number: 4142145Abstract: A method which utilizes low-energy electron reflections to determine the ctron affinity and to simultaneously locate the position of the conduction-band edge with respect to the Fermi level at the surface of a single-crystal semiconductor. A beam of very-low-energy electrons (<10eV) is directed onto the surface of the semiconductor and the reflection pattern (beam energy v. current collected by the semiconductor) is analyzed using a kinematical approximation for the interference phenomena.Type: GrantFiled: December 22, 1977Date of Patent: February 27, 1979Assignee: The United States of America as represented by the Secretary of the NavyInventors: George A. Haas, Arnold Shih, Richard E. Thomas
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Patent number: 4101800Abstract: An emissive member for a controlled-porosity, dispenser-type cathode comping a three-component sandwich consisting of: (1) a supporting disc; (2) a layer of nonsintered alkaline earth material on said disc; and (3) a thin perforated foil on said layer. The foil is made of refractory metal and has a uniform pattern of tiny holes through which the active material of the reservoir migrates to coat the surface of the foil, the foil thus serving as the electron-emitting surface of the cathode.Type: GrantFiled: July 6, 1977Date of Patent: July 18, 1978Assignee: The United States of America as represented by the Secretary of the NavyInventors: Richard E. Thomas, Titus Pankey, Jr.
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Patent number: 4097637Abstract: A master adapted to be imaged in the manner of an electronic stencil for use in producing multiple copies containing latent images in which the master comprises a base sheet having multiple coatings including a first coating containing an alcohol and/or water soluble colorless colorforming component and a highly electrically conductive coating overlying the first coat and which, in addition, contains a less highly electrically conductive coating overlying the highly electrically conductive coating and a masking coat as the top coat.Type: GrantFiled: March 29, 1976Date of Patent: June 27, 1978Assignee: A. B. Dick CompanyInventors: Adrian M. Loria, Richard E. Thomas
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Patent number: 4051283Abstract: A system for the preparing of copy containing concealed images and a marking material for the development of same in which the components comprise a receiving material in the form of starch or polyvinyl alcohol, an iodide which is oxidizable to iodine, and an oxidizing agent for oxidizing the iodide in which the oxidizing agent is contained in the imaging material to produce the concealed image, the iodine is contained in the marking material for the development of the image and the starch or polyvinyl alcohol are contained in the copy sheet, the printing material or the marking material whereby, when the marking material is applied to the concealed image, the oxidizing agent oxidizes the iodide to release iodine for producing an intense color with the starch or polyvinyl alcohol and in which the printing process is adapted to conventional printing systems.Type: GrantFiled: June 28, 1971Date of Patent: September 27, 1977Assignee: A. B. Dick CompanyInventors: Richard E. Thomas, Robert T. Florence, Rustom H. Dalal, Raymond I. Scheuer
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Patent number: 4038761Abstract: An element for use as a teaching, examination and instructional material formed of a sheet having a visible image imprinted thereon and coded images keyed to the visible image in which the coded images are formed with a material, such as liquid crystals, which changes in appearance in response to temperature and in which the material in one of the images has a different temperature response than the material in the others of the images whereby the sheet is capable of multiple use as a teaching, examination and instructional element.Type: GrantFiled: February 17, 1976Date of Patent: August 2, 1977Assignee: A. B. Dick CompanyInventor: Richard E. Thomas
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Patent number: 3971110Abstract: An improved technique for forming an electron emitting cathode of iridium d similar noble metals. A mixture of powders including a matrix material of one of the noble metals and a pore forming material of silver is shaped into a cathode configuration and sintered at a temperature sufficient to evaporate the silver, thereby producing a porous matrix. The matrix is impregnated with an active material and dried to produce a cathode having increased electron emission characteristics allowing operation at lower temperatures for longer time periods.Type: GrantFiled: September 11, 1975Date of Patent: July 27, 1976Assignee: The United States of America as represented by the Secretary of the NavyInventors: Richard E. Thomas, George A. Haas
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Patent number: D295780Type: GrantFiled: September 17, 1984Date of Patent: May 17, 1988Inventor: Richard E. Thomas