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580 Matching Results
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Method and apparatus for injecting a substance into the bloodstream of a subject
An apparatus and method for injecting a substance, such as a radiopharmaceutical, into the bloodstream of a subject is described. The apparatus comprises an injection means, such as a servo controlled syringe, a means for measuring the concentration of that substance in the subject's bloodstream, and means for controlling the injection in response to the measurement so that the concentration of the substance follows a predetermined function of time. The apparatus of the subject invention functions to inject a substance into a subject's bloodstream at a rate controlled by an error signal proportional to the difference between the concentration of the substance in the subject's bloodstream and the predetermined function.
Date:
May 29, 1981
Creator:
Lambrecht, R. M.; Bennett, G. W.; Duncan, C. C. & Ducote, L. W.
System:
The UNT Digital Library
Production of super-smooth articles
Super-smooth rounded or formed articles made of thermoplastic materials including various poly(methyl methacrylate) or acrylonitrile-butadiene-styrene copolymers are produced by immersing the articles into a bath, the composition of which is slowly changed with time. The starting composition of the bath is made up of at least one solvent for the polymer and a diluent made up of at least one nonsolvent for the polymer and optional materials which are soluble in the bath. The resulting extremely smooth articles are useful as mandrels for laser fusion and should be useful for a wide variety of other purposes, for example lenses.
Date:
May 29, 1981
Creator:
Duchane, D. V.
System:
The UNT Digital Library
Thermoelectric refrigerator having improved temperature-stabilization means
A control system for thermoelectric refrigerators is disclosed. The thermoelectric refrigerator includes at least one thermoelectric element that undergoes a first order change at a predetermined critical temperature. The element functions as a thermoelectric refrigerator element above the critical temperature but discontinuously ceases to function as a thermoelectric refrigerator element below the critical temperature. One example of such an arrangement includes thermoelectric refrigerator elements which are superconductors. The transition temperature of one of the superconductor elements is selected as the temperature control point of the refrigerator. When the refrigerator attempts to cool below the point, the metals become superconductors losing their ability to perform as a thermoelectric refrigerator. An extremely accurate, first-order control is realized.
Date:
July 29, 1981
Creator:
Falco, Charles M.
System:
The UNT Digital Library
Method for determining the hardness of strain hardening articles of tungsten-nickel-iron alloy
The present invention is directed to a rapid nondestructive method for determining the extent of strain hardening in an article of tungsten-nickel-iron alloy. The method comprises saturating the article with a magnetic field from a permanent magnet, measuring the magnetic flux emanating from the article, comparing the measurements of the magnetic flux emanating from the article with measured magnetic fluxes from similarly shaped standards of the alloy with known amounts of strain hardening to determine the hardness.
Date:
July 29, 1981
Creator:
Wallace, S.A.
System:
The UNT Digital Library
Electrochemical cell and negative electrode therefor. [Li-Al anode]
A secondary electrochemical cell is described with the positive and negative electrodes separated by a molten salt electrolyte with the negative electrode comprising a particulate mixture of lithium-aluminum alloy and electrolyte and an additive selected from graphitized carbon, Raney iron or mixtures thereof. The lithium-aluminum alloy is present in the range of from about 45 to about 80% by volume of the negative electrode, and the electrolyte is present in an amount not less than about 10% by volume of the negative electrode. The additive of graphitized carbon is present in the range of from about 1 to about 10% by volume of the negative electrode, and the Raney iron additive is present in the range of from about 3 to about 10% by volume of the negative electrode.
Date:
July 29, 1981
Creator:
Kaun, T.D.
System:
The UNT Digital Library
Pressure gradient passivation of carbonaceous material normally susceptible to spontaneous combustion
This invention is a process for the passivation or deactivation with respect to oxygen of a carbonaceous material by the exposure of the carbonaceous material to an oxygenated gas in which the oxygenated gas pressure is increased from a first pressure to a second pressure and then the pressure is changed to a third pressure. Preferably a cyclic process which comprises exposing the carbonaceous material to the gas at low pressure and increasing the pressure to a second higher pressure and then returning the pressure to a lower pressure is used. The cycle is repeated at least twice wherein the higher pressure may be increased after a selected number of cycles.
Date:
January 29, 2002
Creator:
Ochs, Thomas L.; Sands, William D.; Schroeder, Karl; Summers, Cathy A. & Utz, Bruce R.
System:
The UNT Digital Library
Apparatus and Method for Increasing the Diameter of Metal Alloy Wires Within a Molten Metal Pool
In a dip forming process the core material to be coated is introduced directly into a source block of coating material eliminating the need for a bushing entrance component. The process containment vessel or crucible is heated so that only a portion of the coating material becomes molten, leaving a solid portion of material as the entrance port of, and seal around, the core material. The crucible can contain molten and solid metals and is especially useful when coating core material with reactive metals. The source block of coating material has been machined to include a close tolerance hole of a size and shape to closely fit the core material. The core material moves first through the solid portion of the source block of coating material where the close tolerance hole has been machined, then through a solid/molten interface, and finally through the molten phase where the diameter of the core material is increased. The crucible may or may not require water-cooling depending upon the type of material used in crucible construction. The system may operate under vacuum, partial vacuum, atmospheric pressure, or positive pressure depending upon the type of source material being used.
Date:
January 29, 2002
Creator:
Hartman, Alan D.; Argetsinger, Edward R.; Hansen, Jeffrey S.; Paige, Jack I.; King, Paul E. & Turner, Paul C.
System:
The UNT Digital Library
Belt Fastener
Patent for a belt fastener. Illustration included.
Date:
June 29, 1909
Creator:
Stenzel, Frank O.
System:
The Portal to Texas History
Cotton Chopping Machine
Patent for a cotton chopping machine. This invention is used to thin cotton plants with revolving blades that cut and destroy plants. Illustrations included.
Date:
January 29, 1907
Creator:
Tucker, Samuel Houston
System:
The Portal to Texas History
Cotton-Picker for Forming Mattress-Bats.
Patent for improvements in cotton-pickers for forming mattress-bats is to prepare the cotton to be light and elastic when the cotton is compressed into mattress-bats. Illustration is included.
Date:
April 29, 1902
Creator:
Morgan, John W.
System:
The Portal to Texas History
Combined Tie-Plate and Rail Anticreeper
Patent for a railroad tie plate designed to remained locked to the base of the rail and to prevent dislocation of the base. Illustrations included.
Date:
March 29, 1910
Creator:
Clarke, Marcus S. & Adreon, Edward L., Jr.
System:
The Portal to Texas History
Coupling for Connecting Handles to Tools
Patent for "new and useful Improvements in Couplings for Connecting Handles to Tools" (lines 5-7) with description and illustration.
Date:
July 29, 1902
Creator:
Suttle, Willis A.
System:
The Portal to Texas History
Cotton-Chopper.
Patent for a combined cotton-chopper and cultivator.
Date:
July 29, 1902
Creator:
Forister, John H. & McAda, James N.
System:
The Portal to Texas History
Copy-Holder.
Patent for a copy holder with a firmer clamp and a better support for the line indicating bar than previous versions.
Date:
September 29, 1908
Creator:
Flynn, Melvina L.
System:
The Portal to Texas History
Animal-Trap.
Patent for certain new and useful improvements in animal traps, including instructions and illustrations.
Date:
August 29, 1899
Creator:
Griffin, Walter R.
System:
The Portal to Texas History
Baling-Press.
Patent for a new and useful baling press, including instructions and illustrations.
Date:
November 29, 1898
Creator:
Gowan, Albert G.
System:
The Portal to Texas History
Couch
Patent for a couch. This design is meant to be mouse proof. Illustrations included.
Date:
December 29, 1903
Creator:
Hardtmann, Julius R.
System:
The Portal to Texas History
Axle-Skein.
Patent for an improved version of a certain type of axel skein or spindle holder (the kind in which a spindle with a box or housing rigidly holds a tapered axle.) This patent claims to be an improvement by “simple and inexpensive construction and in which the connections are such that the parts can be conveniently joined or separated and when joined produce a strong and durable combination” (lines 14-21).
Date:
September 29, 1903
Creator:
Cryer, Henry M.
System:
The Portal to Texas History
Apparatus for Treating Granular Materials
Patent for an apparatus for treating granular materials. Illustrations included.
Date:
October 29, 1912
Creator:
Lanaux, Alfred A.
System:
The Portal to Texas History
Adjustable Brace for Doors or Gates and Cover for Same
Patent for an adjustable brace for doors or gates. It is designed to prevent sagging.
Date:
September 29, 1903
Creator:
Shields, John
System:
The Portal to Texas History
Crate or Coop
Patent for a coop for the transportation of livestock which can be folded compactly to occupy smaller space. Illustrations included.
Date:
December 29, 1908
Creator:
La Bauve, Odelon Joseph
System:
The Portal to Texas History
Car-Coupling
Patent for a car-coupling that "will greatly simplify the construction and facilitate the operation thereof by providing levers upon the end of the car" (lines 14-17); including illustration and instructions
Date:
May 29, 1900
Creator:
Asher, A. J. & Gautt, W. A.
System:
The Portal to Texas History
Breast-Strap
Patent for a breast strap with snap hooks that reduces wear on the strap.
Date:
March 29, 1910
Creator:
Hewitt, Ditus P.
System:
The Portal to Texas History
Combined Hoe and Edge-Trimmer.
Patent for a tool that combines a how and edge-trimmer in one. The tool "may be conveniently used for trimming the edges of lawns, walks, and flower-beds and which may also be used as a weeding scuffle-hoe and as a sod-cutter" (lines 11-14) including illustrations
Date:
August 29, 1905
Creator:
Hough, James C. & Oldham, J. B.
System:
The Portal to Texas History