Patents Examined by B. Hunt
  • Patent number: 4025305
    Abstract: The present disclosure relates to a process for the continuous pad-dyeing or printing of continuous synthetic filament groups with dyestuffs which are set under the influence of heat. More particularly, the present disclosure is directed to a process for the continuous pad-dyeing of synthetic filament groups wherein a heated treatment medium, for example air, is passed through the filament groups which have been printed or padded with the preparations containing the dyestuffs. By drawing heated air through the material being treated a completely uniform drying of the filament groups and also a uniform dyestuff setting is obtained and a migration of the dyestuffs is substantially avoided.
    Type: Grant
    Filed: January 19, 1973
    Date of Patent: May 24, 1977
    Assignee: Vepa AG
    Inventor: Heinz Fleissner
  • Patent number: 4002473
    Abstract: The process for producing anodes on fixtures comprises the following steps. A stringer with risers of film forming metal welded at right angles to the stringer is lowered into row of cavities in an elastomeric mold which have been filled with a slurry including a freezable bonding agent and film-forming metal powder. The risers are centered in the cavities. The powder slurry is frozen with the risers held in registration with the mold pattern. After solidification of the slurry the stringer is withdrawn and the frozen anodes are pulled out of the mold cavities. Predrying preferably with the risers in place prior to freezing removes excess water so that the anodes after thawing will retain their shape and have sufficient strength to withstand the limited handling necessary to transfer them to the sintering equipment.
    Type: Grant
    Filed: November 29, 1973
    Date of Patent: January 11, 1977
    Assignee: P. R. Mallory & Co., Inc.
    Inventor: Gerhart P. Klein
  • Patent number: 3977071
    Abstract: A process for etching high depth-to-width ratio grooves in the surface of monocrystalline germanium-comprising semiconductor material by orienting the material so that the surface to be etched is parallel to a (110) plane of the crystal structure; orienting an etching mask on that surface such that the length of the groove to be etched is parallel to a (111) plane of the crystal which is normal to said surface; and subjecting the semiconductor material to a preferential etchant which attacks fastest in a [110] direction of a germanium crystal and slowest in a [111] direction.
    Type: Grant
    Filed: September 29, 1969
    Date of Patent: August 31, 1976
    Assignee: Texas Instruments Incorporated
    Inventor: Hall E. Jarman
  • Patent number: 3966423
    Abstract: A sintered steel-bonded titanium carbide composition characterized by an improved combination of physical and anti-friction properties is provided comprising about 15% to 60% by weight of primary grains of titanium carbide dispersed through a steel matrix making up essentially the balance, the steel matrix being characterized metallographically by an austenitic decomposition product, said steel-bonded titanium carbide composition containing an effective amount of a grain-growth inhibitor ranging by weight from about 0.25% to 2% of a columbium-group carbide.
    Type: Grant
    Filed: November 6, 1973
    Date of Patent: June 29, 1976
    Inventors: M. Kumar Mal, Stuart E. Tarkan
  • Patent number: 3965238
    Abstract: Uranium values are obtained from phosphate rock by acidifying phosphate rock containing uranium values and at least one other heavy metal with a mineral acid so as to obtain a crude acid, solvent extracting the crude acid with an organic solvent so as to separate a raffinate from a relatively pure, wet process phosphoric acid and treating said raffinate with a base so as to raise the pH to 1-2 whereby uranium hydroxide or phosphate and other heavy metal hydroxides or phosphates are coprecipitated. The uranium content of the coprecipitate after drying is at least as high as 0.3% which is comparable to that of uranium ores of the highest quality.
    Type: Grant
    Filed: July 27, 1973
    Date of Patent: June 22, 1976
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Tomokazu Tabata, Tetsuo Ikushige
  • Patent number: 3962102
    Abstract: A subterranean formation (e.g. gas, oil or water bearing formation) is acidized with an emulsion comprising an aqueous acidizing solution, an oil and a cationic surfactant which renders oil-containing earthen formations oil-wet, said surfactant being present in said emulsion in an amount which is sufficient to increase the reaction time of the acid acting on the formation.
    Type: Grant
    Filed: December 17, 1973
    Date of Patent: June 8, 1976
    Assignee: The Dow Chemical Company
    Inventor: Curtis W. Crowe
  • Patent number: 3962101
    Abstract: A formation is acidized with a composition comprising a formation acidizing acid and a cationic surfactant which renders oil-containing earthen formations oil-wet, said surfactant being present in said composition in an amount which is sufficient to increase the reaction time of the acid acting on the formation.
    Type: Grant
    Filed: December 17, 1973
    Date of Patent: June 8, 1976
    Assignee: The Dow Chemical Company
    Inventor: Curtis W. Crowe
  • Patent number: 3959003
    Abstract: A thixotropic cementing composition for use in oil and gas wells comprises a hydraulic cement slurry including as an additive a complex reaction product of a water soluble carboxyalkyl, hydroxyalkyl or mixed carboxyalkyl hydroxyalkyl ether of cellulose, and a polyvalent metal salt, for example a reaction product of hydroxyethylcellulose and zirconyl chloride.
    Type: Grant
    Filed: July 20, 1973
    Date of Patent: May 25, 1976
    Assignee: Halliburton Company
    Inventors: Gabriel W. Ostroot, Jiten Chatterji
  • Patent number: 3957453
    Abstract: An electric contact material comprises a matrix formed by refractory metal powder particles having interbonding portions and defining pores infiltrated by a solidified molten metal impregnant. The interbonding portions are formed by a solidified molten alloy formed by the refractory metal and an alloying metal, and has a melting temperature above the impregnant's melting temperature. The alloying metal is present in an amount that is small relative to that of the refractory metal but which is effective for the formation of the interbonding portions by the alloy. The material may be made by cold molding the refractory metal powder particles and powder particles of the alloying metal, to form a compact which is then sintered without being under pressure. The interbonding alloy forms during the sintering, and when solidified, forms the interbonding portions between the particles defining the pores. By infiltration these portions are filled with the molten impregnating metal.
    Type: Grant
    Filed: July 23, 1973
    Date of Patent: May 18, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventors: Heinrich Hassler, Hans-Joachim Lippmann
  • Patent number: 3954461
    Abstract: The apparent density of molding-grade, water atomized steel powder can be significantly decreased by employing the following prescribed treatment. Coarse particles are removed in order that at least 80% of the initial powders are finer than 80 mesh. The size distribution of the powders is then determined. The powders are then annealed to both reduce the carbon and oxygen contents and soften the particles. The annealed and agglomerated particles are then ground in a disk mill at specified speeds and gap spacings, depending on the size distribution of the initial powders. Apparent densities less than 2.8 gm/cc may be achieved by (a) employing powders with a finer particle size distribution, (b) decreasing the rotational speed of the disks and (c) increasing the mill gap.
    Type: Grant
    Filed: February 11, 1974
    Date of Patent: May 4, 1976
    Assignee: United States Steel Corporation
    Inventors: Hung-Chi Chao, John H. Gross, Robert R. Judd, Roger L. Rueckl
  • Patent number: 3954459
    Abstract: To make an electric contact material, a molten alloy of silver and a non-noble metal is atomized into spheroidal particles having a particle size ranging up to almost 1 mm, and the fraction of these particles having a particle size ranging between 0.2 and 1 mm is separated, a small remainder of smaller particle size being treated as a reflux. This fraction is heated in an oxidizing atmosphere to oxidize the non-noble metal internally within the particles and the latter are then mechanically broken, as by suitable milling or pulverizing, into fragments having a particle size no greater than about 0.3 mm. The fragmented particles are then compressed, as by pressure molding, extrusion, etc., and sintered to provide a sintered silver-metal oxide electric contact material.
    Type: Grant
    Filed: November 27, 1973
    Date of Patent: May 4, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventors: Horst Schreiner, Bernhard Rothkegel
  • Patent number: 3954399
    Abstract: A process for dyeing a nitrogen-containing fiber, which comprises dyeing the fiber in a dye bath containing a halogenated hydrocarbon solvent, and a dye complex of an anionic dye with an amine of the formula: represents ##EQU1## wherein R.sub.1 represents a saturated or unsaturated hydrocarbon residue having 8 to 22 carbon atoms, R.sub.2 represents a saturated or unsaturated divalent hydrocarbon residue having 2 to 6 carbon atoms, said hydrocarbon residue for R.sub.1 and R.sub.2 may be of a straight or branched chain, n represents an integer of 1 to 4, each member of R.sub.2 may be the same or different when n is 2 or more, R.sub.3 and R.sub.4 each respresents a hydrogen atom, a lower alkyl or hydroxyalkyl group having 1 to 3 carbon atoms, and R.sub.3 and R.sub.4 may be the same or different.
    Type: Grant
    Filed: March 26, 1973
    Date of Patent: May 4, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yoshio Nemoto, Hiroyuki Funahashi, Takeo Miyake
  • Patent number: 3954648
    Abstract: This invention relates to liquid compositions and methods of using them for removing coatings from coated metal surfaces, particularly metals, and especially those metals subject to attack by corrosive liquids. The compositions comprise from one-fourth to about 10% by weight of alkali metal hydroxide, from 40 to about 60% by weight of at least one liquid high boiling oxygenated solvent, and from 40 to about 60% by weight of at least one liquid high boiling amine. Optionally, the compositions may contain from one-half to about 20% by weight of a surface active or wetting agent.The method of use comprises applying the anhydrous liquid composition to the coated object at a temperature from ambient up to the boiling point of the composition for a time sufficient to loosen or remove the coating.
    Type: Grant
    Filed: February 5, 1973
    Date of Patent: May 4, 1976
    Assignee: Pennwalt Corporation
    Inventors: Edward John Belcak, Leo Francis Corcoran
  • Patent number: 3951880
    Abstract: The marked dusting characteristics of dry powder alkali-metal salts of alpha-olefin sulfonates are substantially inhibited by incorporating therein minor proportions of alkanolamine salts of alpha-olefin sulfonates.
    Type: Grant
    Filed: February 2, 1973
    Date of Patent: April 20, 1976
    Assignee: Witco Chemical Corporation
    Inventors: Marvin Mausner, Brij L. Kapur
  • Patent number: 3950165
    Abstract: A method of sintering ferrous materials comprises mixing an iron powder with an alloy of iron-titanium and forming a liquid phase during the sintering. The alloy is prepared by mixing selected amounts of iron and titanium powders to form an iron-titanium alloy powder consisting essentially of 14 to 46% by weight of titanium and the balance iron, and preferably 14 to 30% by weight of titanium. The sintering step is carried out at a temperature at which the powdered mixture is always in the liquid phase during sintering. Under these conditions oxidation of titanium is suppressed during melting and the alloy is not too soft nor too difficult to pulverize and used for manufacturing the machine components such as piston rings which have surprisingly good properties due to the use of the critical amounts of iron and titanium in the alloys useful according to the invention.
    Type: Grant
    Filed: September 6, 1973
    Date of Patent: April 13, 1976
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Teishiro Oda, Takashi Daikoku
  • Patent number: 3945792
    Abstract: A process for the filling of leather tanned with mineral, vegetable and/or synthetic tanning agents by treating the leather, in the acid pH-range , with an aqueous solution of a filling agent consisting of unsubstituted or substituted homo- or copolymeric acrylic acids and protein glue, alone or in admixture with further additives, as well as dry or liquid compositions thereof, are disclosed; thereby an even fullness of the leather is obtained without impairing the handle, the buffing properties, the tightness of the grain, the fine grain or the dyeability of said leathers.
    Type: Grant
    Filed: February 28, 1973
    Date of Patent: March 23, 1976
    Assignee: Ciba-Geigy Corporation
    Inventors: Albert Wurmli, Hubert Wachsmann
  • Patent number: 3945863
    Abstract: A process for pretreating metal powders for the preparation of dispersion hardened metal alloys whereby an iron, cobalt or nickel base metal powder is homogeneously mixed with a chromium powder and with a prealloyed metal carbide powder and granulated to a powder granulate. The granulate is then classified and reduced to remove oxygen present therein.
    Type: Grant
    Filed: September 20, 1973
    Date of Patent: March 23, 1976
    Assignee: Martin Marietta Corporation
    Inventor: Walter Precht
  • Patent number: 3943210
    Abstract: A method of fabricating a group IVB metal hydride body having a hydrogen content of at least 55 atom percent and a high density, which comprises mixing together powders of said metal hydride having less than about 55 atom percent hydrogen with powders of said metal hydride having at least about 60 atom percent hydrogen, and then hot forming the resulting mixture to cause flow of ductile powders and thereby give a high density compact.
    Type: Grant
    Filed: April 9, 1964
    Date of Patent: March 9, 1976
    Assignee: Rockwell International Corporation
    Inventor: James B. Vetrano
  • Patent number: 3940268
    Abstract: The production of rotor discs by bonding a plurality of fully dense, preformed blades to a hub of compacted alloy powder. The blades are embedded in the uncompacted powder and by the use of hot isostatic compacting the powder is compacted to full density to form the hub and the blades are bonded thereto simultaneously.
    Type: Grant
    Filed: April 12, 1973
    Date of Patent: February 24, 1976
    Assignee: Crucible Inc.
    Inventor: John P. Catlin
  • Patent number: 3937618
    Abstract: A method is provided for producing a bi-metal object comprised of at least one image area raised in relief on the base of the object. The area in relief and the base of the object consist of different metals. The method comprises compacting the metal powder which will constitute the image area raised in relief; compacting the metal powder which will constitute the base of the bi-metal object while that powder is in direct contact with the metal powder already compacted to form the area in relief; sintering the composite at a relatively low temperature and for a preferred interval of time; and striking a chosen design on the base of the bi-metal object. The finished product will comprise an image area raised in relief which will be of appreciable height; the image area raised in relief will be separated from the base by a sharp regular border; and the base may retain a proof finish.
    Type: Grant
    Filed: July 9, 1973
    Date of Patent: February 10, 1976
    Assignee: Franklin Mint Corporation
    Inventor: Kathleen E. Kirkham