Patents by Inventor A. H. Davidson

A. H. Davidson 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).

  • Patent number: 4654706
    Abstract: This invention relates to a structure to automatically adjust the image characteristics of a television set or monitor as one of the final steps in a manufacturing process and a method for effecting the adjustments and tests which can be practiced by the structure.
    Type: Grant
    Filed: June 3, 1985
    Date of Patent: March 31, 1987
    Assignee: International Business Machines Corp.
    Inventors: William H. Davidson, Ian Miller
  • Patent number: 4639280
    Abstract: A monocrystalline alloy with a high resistance to creep having a nickel base matrix, with a density of the order of 8.5 and having a percentage, by weight, composition as follows: Co 5 to 8%--Cr 6.5 to 10%--Mo 0.5 to 2.5%--W 5 to 9%--Ta 6 to 9%--Al 4.5 to 5.8%--Ti 1 to 2%--Nb 0 to 1.5%--C, Zr, and B each less than 100 ppm--Ni remainder to 100%. Furthermore, the summation Ta+Mo+1/2 W lies between 11.5% and 13.5% by weight, the atomic sum Ti+Al+Ta+Nb lies between 15.5% and 17%, the atomic sum Ta+Nb+Mo+1/2 W lies between 4% and 5.5%, the atomic sum Ti+Al+Ta+Nb+Mo+1/2 W lies between 17.5% and 19% and the atomic sum Ti+Al lies between 12.8% and 14.5%.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: January 27, 1987
    Assignees: Association pour la Recherche et le Developpement des Methodes et Processus Industriels "A.R.M.I.N.E.S.", Societe Imphy S.A., Office National d'Etudes et de Recherche Aerospatiales (ONERA), Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
    Inventors: Allan Fredholm, James H. Davidson, Tasadduq Khan, Jean-Mare C. F. Theret
  • Patent number: 4622467
    Abstract: A system for mapping radioactive specimens comprises an avalanche counter, an encoder, pre-amplifier circuits, sample and hold circuits and a programmed computer. The parallel plate counter utilizes avalanche event counting over a large area with the ability to locate radioactive sources in two dimensions. When a beta ray, for example, enters a chamber, an ionization event occurs and the avalanche effect multiplies the event and results in charge collection on the anode surface for a limited period of time before the charge leaks away. The encoder comprises a symmetrical array of planar conductive surfaces separated from the anode by a dielectric material. The encoder couples charge currents, the amplitudes of which define the relative position of the ionization event. The amplitude of coupled current, delivered to pre-amplifiers, defines the location of the event.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: November 11, 1986
    Assignee: California Institute of Technology
    Inventors: Roy J. Britten, Eric H. Davidson
  • Patent number: 4591567
    Abstract: A system for the production and maintenance of genomic libraries of recombinant DNA in a fixed geometric array arranged so that such libraries may be accurately replicated and maintained with the same set of individual DNA inserts occupying reproducible locations and comprising,(a) sets of individual bacterial colonies or plaques of bacteriophage which contain inserts of animal or plant DNA and are present in so large a number that there will be a high probability that the complete library will contain each DNA sequence of all of the sequences present in an animal or plant genome; to be established in subarrays which can individually be replicated,(b) a subsystem for picking up inocula from each of a geometric array simultaneously and transferring them to a second similar geometric array, including carrying and aligning means for maintaining a transfer means in superposed relationship with respect and for raising and lowering the transfer means into and out of proximity to said colonies or plaques, and(c) a s
    Type: Grant
    Filed: August 8, 1983
    Date of Patent: May 27, 1986
    Assignee: California Institute of Technology
    Inventors: Roy J. Britten, Eric H. Davidson
  • Patent number: 4515449
    Abstract: A head harness for glasses comprised of a first elongated strap that fits over the head of a person and containing closed loops at each end for engaging the midsection of the temple pieces of a pair of eyeglasses frames; a second elongated strap that fits around the rear of the head of a person and containing closed loops for engaging the rear sections of temple pieces; and an elongated strap that is sewn at each of its ends to the midsections of the first and second elongated straps. The straps are all constructed in a preadjusted length and are made of a slightly elastic material in order to provide a secure fit when used with different style eyeglasses and different head sizes.
    Type: Grant
    Filed: February 16, 1983
    Date of Patent: May 7, 1985
    Inventor: Katharine H. Davidson
  • Patent number: 4500786
    Abstract: Novel large area spark chamber having a support for carrying a generally planar, radioactive work piece. The spark chamber has a thin window which is either a rigid plastic sheet carrying a thin layer of an electrically conductive material on the surface thereof, or a thin planar piece or film of electrically conductive metal. There is positioned in superposed relationship to the thin window, a layer of semi-conducting glass in spaced-apart relationship from the thin window by a resilient insulating seal to form an enclosed gas retaining chamber. An electrically conducting surface is adhered to the upper surface of the layer of semi-conducting glass. An electrically conductive path is provided between the thin layer of electrically conductive material on the thin window and the electrically conducting surface on said semi-conducting glass. The electrically conductive path includes a high voltage supply and TDCs and ADCs.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: February 19, 1985
    Assignee: California Institute of Technology
    Inventors: Roy J. Britten, Eric H. Davidson
  • Patent number: 4399824
    Abstract: A loose probe alarm in which a temperature responsive element (14) arranged for attachment to a body is periodically heated (20, 22, 26) and the effects of self-heating of the temperature responsive element are monitored (32, 36, 38) to determine whether the temperature responsive element has been dislodged from the body. The alarm is arranged to sense the difference in the amount of heat dissipated by the temperature responsive element when it remains in contact with the body to which it has been attached and when it has been dislodged from this body.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: August 23, 1983
    Assignee: Air-Shields, Inc.
    Inventor: Ian H. Davidson
  • Patent number: 4360234
    Abstract: Method and apparatus for introducing finely divided gas bubbles into a lixiviant used for in-situ mining of minerals containing metal values, such as copper values. The lixiviant is supplied to a plurality of porous tubes formed of sintered powdered metal while a gas is supplied under pressure about the tubes to cause the gas to penetrate into the interior of the tubes in the form of fine bubbles which are wiped from the interior of the tubes by the lixiviant passing therethrough.The method and apparatus can be advantageously employed in situations where it is desirable to perform in-situ mining with an oxidizing lixiviant. In these cases oxygen is supplied under pressure about the tubes.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: November 23, 1982
    Assignee: Kennecott Copper Corporation
    Inventors: Limin Hsueh, Robert A. Hard, Donald H. Davidson, Ray V. Huff
  • Patent number: 4342484
    Abstract: Methods for increasing the permeability of a subterranean igneous rock formation penetrated by at least one well where a hydraulic fluid is injected into the formation at a pressure sufficient to cause diffusion into the natural fractures thereof and thus increase the cross-sectional area thereof, maintaining the pressure and injecting a second fluid which results, by the use thereof, in substantially maintaining the increased cross-sectional area after the pressure is reduced.
    Type: Grant
    Filed: August 14, 1975
    Date of Patent: August 3, 1982
    Assignee: Kennecott Corporation
    Inventors: Donald H. Davidson, Ray V. Huff
  • Patent number: 4261767
    Abstract: An alloy which is resistant to high temperature oxidation includes by weight 15 to 30% of chromium, at least 10% of nickel, at least 20% of iron, 4 to 6% of aluminum and at least 0.001% of at least one metal belonging to the group formed by the rare earths and metals in the same category, such as yttrium and scandium.
    Type: Grant
    Filed: December 14, 1978
    Date of Patent: April 14, 1981
    Assignee: Creusot-Loire
    Inventor: James H. Davidson
  • Patent number: 4206521
    Abstract: A bulkhead for a swimming pool has a simple, lightweight frame, improved movability within the pool and means for suppressing the ill effects of waves produced by a swimmer nearing the bulkhead.
    Type: Grant
    Filed: September 29, 1978
    Date of Patent: June 10, 1980
    Inventor: Dekkers H. Davidson
  • Patent number: 4151882
    Abstract: An anchoring and fire extinguishing system for mobile homes and the like comprising a water filled container that has a shape which is complementary to the peripheral outer edge of the mobile home, such that the mobile home may be positioned on top of the filled water container and supported thereby. The interior of the water filled container is provided with a pressurizing means operable to maintain the pressure of the water at a sufficient level such that water may be communicated through suitable conduits to a plurality of sprinkling heads disposed within the interior of the mobile home to extinguish a fire therein.
    Type: Grant
    Filed: July 20, 1977
    Date of Patent: May 1, 1979
    Inventors: Francis E. Baker, James H. Davidson
  • Patent number: 4125289
    Abstract: A circulation tubing string is disposed about the lixiviant return tubing string in the production hole of an in situ minefield. The circulation string extends from the surface to a point near a packer which defines the top of the leaching interval. A fluid coupler provides a fluid flow path between the annular cross-section regions between the production hole casing and the circulation string, and between the circulation string and the lixiviant return string. A flow of cooling fluid is maintained from the surface through the circuital path defined by the annular cross-section regions and the fluid coupler, particularly including the exterior surface of the production tubing string. The fluid is maintained at a temperature and flow rate so that the pregnant leach liquor flows in the production tubing string between the leaching interval and the surface is characterized by a predetermined temperature drop.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: November 14, 1978
    Assignee: Kennecott Copper Corporation
    Inventors: Ray V. Huff, Donald H. Davidson
  • Patent number: 4116488
    Abstract: An environmentally compatible, industrially safe, and potentially economic means for recovering copper and/or nickel from deep-seated deposits without resorting to extensive underground development. A two-phase ammoniacal leach solution containing oxygen bubbles is forced under high pressure through an injection hole several thousand feet deep into a leaching interval of a deep lying deposit containing copper or nickel or copper and nickel. The two-phase leach solution travels through the leaching interval of the deep lying deposit and is pumped out of withdrawal holes spaced apart from the injection hole.The two-phase leach solution under high pressure (more than 500 psi) penetrates the deposit through cracks, fissures and fractures, leaching copper and/or nickel along the way. Under a controlled pressure gradient, the leaching solution migrates over a period of time to receiving holes from which the pregnant leaching solution is withdrawn.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: September 26, 1978
    Assignee: Kennecott Copper Corporation
    Inventors: Limin Hsueh, Robert A. Hard, Donald H. Davidson, Ray V. Huff
  • Patent number: 4045084
    Abstract: A process is disclosed for in-situ mining of copper from a subterranean ore body characterized, at least in part, by the presence of a sulfidic ore and by natural, microscopic fracture openings. The process comprises forcing a stable, two-phase lixiviant comprising an aqueous phase, a multiplicity of gaseous, oxygen-containing bubbles having a size sufficient to pass through the natural fracture openings in the ore body, and a surfactant for enhancing the formation of the bubbles and for minimizing bubble coalescence through the ore body to leach copper.The aqueous and gaseous phases of the lixiviant are mixed at the surface and injected into the leaching interval through an injection hole, or preferably, are mixed in a subterranean sparger within the hole above the leaching interval. The pregnant liquor is recovered through one or more production holes and, after the copper is recovered, the lixiviant may be reconstituted and recirculated.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: August 30, 1977
    Assignee: Kennecott Copper Corporation
    Inventors: Limin Hsueh, Robert A. Hard, Donald H. Davidson, Ray V. Huff
  • Patent number: 4003765
    Abstract: Cobalt based alloy containing 5% to 30% Ni; 18% to 25% Cr; 5% to 17% of at least one of W, Ta and Mo; 0.10% to 0.30% C; 50 ppm to 200 ppm B; 0 to 0.3% Fe; 0 to 2% Mn; 0 to 1% HF; 0 to 1% La; 0 to 1% Y; 0.5% to 2% in total of Ti and/or Nb, the balance being Co; and a heat treatment for such alloy comprising solution heat treatment in a protective atmosphere at 1150.degree. C to 1250.degree. C for at least 1 hour, rapid cooling, and then age hardening for from 12 to 24 hours at from 750.degree. C to 850.degree. C to effect carbide precipitation of MC carbides, M being titanium or niobium.
    Type: Grant
    Filed: October 1, 1974
    Date of Patent: January 18, 1977
    Assignee: Creusot-Loire
    Inventor: James H. Davidson
  • Patent number: 3962735
    Abstract: A bulkhead for a swimming pool, movable to selected positions along the length of the pool to divide the same into various activity areas, is provided with alignment means for preventing overcanting and jambing, such means being electrically conductive for contacting electrically conductive portions of the pool sides for bonding or grounding the bulkhead. Such a bulkhead for extra wide pools is provided with mid support and floatation elements compatible with the alignment and grounding means.
    Type: Grant
    Filed: December 28, 1973
    Date of Patent: June 15, 1976
    Inventor: Dekkers H. Davidson