Abstract: This disclosure teaches a new article of manufacture. The article includes a glass substrate and an adherent coating on the glass substrate of a gray color. The coating on the glass substrate has a composition selected from the group of glass coating compositions consisting essentially of oxides of cobalt, manganese, and copper, wherein the metal content of the metal oxide composition contains 45-60% by weight of cobalt, 26-39% by weight of manganese, and 12-20% by weight of copper. The actual weight percent of each metal is adjusted so that all metals are within their stated ranges when providing a total of 100% by weight metal. The coated glass substrate can be made into a product which has particular utility as a tinted architectural or a tinted automotive glass product.

Abstract: An improved electrically heated vision unit in which heat can be concentrated in a selected zone or zones thereof includes at least one sheet of a relatively rigid transparent material (12) having a ceramic enamel (14) extending along at least two opposite edges on one surface thereof. A bus bar is associated with each ceramic enamel on each edge of the sheet and has at least one narrow portion (18) overlying and bonded to an associated one of the ceramic enamel, and at least one wide portion (20) in part overlying and bonded to an associated one of said ceramic enamel and in part overlying and bonded to said one surface of the transparent material. The narrow portions and the wide portions of the pair of bus bars are in register with like portions on an opposed one of the bus bars.

Abstract: This specification is directed to a method of improving the conductivity and lowering the emissivity of a doped tin oxide film on the surface of a soda lime silica glass sheet. The method includes the steps of heating the glass sheet to a temperature in a range from 1000.degree. F. to 1250.degree. F. Thereafter, a fluorine-containing compound is applied to a surface of the heated glass sheet to react therewith to form a film in which divalent oxygen atoms and hydroxyl ions on the surface of the glass sheet are replaced with monovalent fluorine atoms. In this manner, the surface of the glass sheet is brought closer to a state of electro-neutrality and the monovalent fluorine atoms form a more stable bond with soda and silica atoms of the surface of the glass sheet. Thereafter, a doped tin oxide film is applied to the film formed on the heated glass sheet to a thickness required to give the doped tin oxide film the desired conductivity and emissivity characteristics.

Abstract: This specification teaches a method of manufacturing a curved windshield with an electrically conductive film thereon. The method includes the steps of placing an electrically conductive film, an oxidizable metal layer, and an oxidized metal layer in layered relationship on a flat glass sheet. A glass templet is cut from the coated sheet and electric bus bars are applied and dried on the electrically conductive film on the coated glass templet. A glass templet is cut from an uncoated glass sheet and the two so-formed templets are united with the coating of the one sheet exposed to the ambient. The glass sheets are heated and bent into curved configuration. Thereafter, a laminating interlayer is placed between the glass templets and the glass templets are laminated together.

Abstract: This specification is directed to a method of forming a glass sheet with a UV-base ceramic paint thereon, the method having the following steps. A UV-base ceramic paint is applied to the glass sheet. The UV-base ceramic paint includes normal ceramic paint components along with, as a new component thereof, finely divided zinc metal powder and finely divided stannous oxide powder. The glass sheet is subjected to UV radiation and then heated to a temperature which softens the glass sheet sufficiently so that the glass sheet can be formed. The glass sheet and the ceramic paint thereon are engaged with a fiberglass covered forming die to form the heated glass sheet to a desired shape. The forming die is removed from engagement with the glass sheet. The finely divided zinc metal powder and finely divided stannous oxide powder addition to the ceramic paint is credited with being effective to prevent sticking of any of the ceramic paint to the forming die.

Abstract: This specification is directed to a method of forming a glass sheet with an oil-base ceramic paint thereon, the method having the following steps. An oil-base ceramic paint is applied to the glass sheet. The oil-base ceramic paint includes normal ceramic paint components along with, as a new component thereof, finely divided zinc metal powder. The glass sheet is heated to a temperature which softens the glass sheet sufficiently so that the glass sheet can be formed. The glass sheet and the ceramic paint thereon are engaged with a fiberglass covered forming die to form the heated glass sheet to a desired shape. The forming die is removed from engagement with the glass sheet. The finely divided zinc metal powder addition to the ceramic paint is credited with being effective to prevent sticking of any of the ceramic paint to the forming die. The glass sheet is cooled to obtain a formed glass sheet with a ceramic paint thereon.

Abstract: A method of making a rotary drill bit comprises forming a hollow mould for moulding at least a portion of the bit body, packing at least a part of the mould with powdered matrix material, and infiltrating the material with a metal alloy in a furnace to form a matrix, the alloy being a copper based alloy containing phosphorus and being selected to provide an infiltration temperature which is not greater than 850.degree. C. and preferably not greater than 750.degree. C.

Abstract: This specification teaches a method of making an electrically heated, glass vision unit having a complex curved configuration. The method is initiated by cutting a glass substrate (10) from a flat glass bracket (12). The glass substrate (10) has first and second surfaces separated by a uniform distance. A pair of electrically conductive bus bars (16--16) are applied to one of the surfaces of the glass substrate (10). The bus bars (16--16) are so positioned on the flat glass substrate (10) that when the substrate (10) is bent to form the glass vision unit of complex curved configuration, the pair of electrically conductive bus bars (16--16) are equally distant from one another throughout their entire extent. The flat glass substrate (10) is bent to form the glass vision unit of complex curved configuration. A conductive coating (20) is applied to the one surface of the glass substrate (10) and extends between the pair of bus bars (16--16) throughout their entire extent.

Abstract: This specification teaches a method for making an electrically heatable windshield of laminated construction. In the method, a pair of glass templets are cut (10) and they include a long glass templet and a short glass templet. The templets are separated (20) from one another. An opaque ceramic paint is applied (30) to an edge portion of a coatable surface of a selected glass templet and is dried (40) thereon. Bus bars are also applied (50) to and dried (60) on the coatable surface of the long glass templet. The glass templets are united (70) and subjected to a bending operation (80) to form a shaped windshield pair. The long glass templet and short glass templet are separated (90). A transparent electrically conductive coating is applied (100) between the bus bars located on the selected glass templet.

Abstract: This specification is directed to a method of making a current collector (14) for a sodium/sulfur battery (10). The current collector so-made is electronically conductive and resistant to corrosive attack by sulfur/polysulfide melts. The method includes the step of forming the current collector for the sodium/sulfur battery from a composite material (16) formed of aluminum filled with electronically conductive fibers selected from the group of fibers consisting essentially of graphite fibers having a diameter up to 10 microns and silicon carbide fibers having a diameter in a range of 500-1000 angstroms.

Abstract: A down-hole signal generator for a mud-pulse telemetry system comprises a flow constrictor defining a throttle orifice for the mud passing along a drill string, a throttling member displaceable with respect to a casing to modulate the mud pressure for the purpose of transmitting measurement data up the drill string, and a turbogenerator incorporating an electrical generator within the casing. The flow constrictor and casing form an integrated unit which is installed within a drill collar and is retrievable by drawing it up the inside of the drill string. The throttling member is displaced by a pump according to the torque required to drive the rotor of the generator which is dependent on the electrical load of the generator. The pump incorporates a rotary valve member which supplies the output of the pump to one or other side of a double-acting ram according as to whether the valve member is rotating with a first phase of rotation or a second phase of rotation.

Abstract: A magnetostrictive generator includes a magnetostrictive transducer having a vanadium permandur core and series connected primary and secondary windings, the secondary winding having more turns that the primary winding. A commutating capacitor is connected in parallel with the primary and secondary windings of the transducer and a switch is connected in series with the primary winding. A storage capacitor, which is connected in parallel with the switch and the primary winding of the inductive transducer, is charged by a remotely located low voltage power supply when the switch is open. When the switch is closed, the storage capacitor discharges through the primary winding of the transducer to charge the commutating capacitor until the transducer reaches saturation, the commutating capacitor discharging thereupon to drive the transducer into hard saturation to produce magnetostrictive action in the core and physically deform the transducer and produce an acoustic signal.

Abstract: A method of manufacturing by a powder metallurgy process a rotary drill bit including a bit body having a plurality of cutting elements mounted on the outer surface thereof comprises the steps of forming a hollow mould for moulding at least a portion of the bit body, packing the mould with powdered matrix material, and infiltrating the material with a metal alloy in a furnace to form a matrix. Before packing the mould with powdered matrix material, there are positioned in spaced locations on the interior surface of the mould a plurality of cutting elements, each of which is formed of a material, such as a polycrystalline diamond material, which is thermally stable at the temperature necessary to form the matrix. Also positioned in the mould, adjacent the rearward side of each cutting element, is a support material such that, at least after formation of the matrix, the support material has a higher modulus of elasticity than the matrix.

Abstract: A nonconducting pipe thread lubricating composition for use in a drill string capable of transmitting electrical signals from a downhole location to the surface of the earth. The composition includes hard and soft moderately deforming materials such as polyphenylene sulfide and talc, and a lubricating solid such as polytetrafluoroethylene dispersed in a viscous lubricating base preferably a lithium based grease.

Abstract: This specification relates to a heat exchanger (10) of the type wherein a plurality of elongated plates (12) are laminated together to define a plurality of passageways (14) for movement of a fluid therethrough. Each of the passageways (14) are formed by inwardly facing surfaces of a pair of laminated plates (12--12) which define a central fluid conducting section (34) located between reservoir sections (32--32) at each end thereof. Adjacent of the passageways (14--14) have heat transfer fins (18--18) located therebetween. Reservoir sections (32--32) of adjacent ones of the passageways (14--14) are interconnected so that a fluid may flow therethrough. The improvement of this invention is made to the laminated plates and it includes a plurality of beads formed on each of the pair of laminated plates (12--12). The beads formed on each of the plates are of two distinct varieties.

Abstract: A gamma ray density sub and method useful for measurement-while-drilling applications utilizing three pairs of gamma ray sources and detectors located symmetrically about the axis of the sub and computation of the product of the counting rates obtained from the three detectors to indicate the average density of a formation sample surrounding a borehole traversing an earth formation. The sub is able to measure the density of the sample, independent of the location of the sub within the borehole and the chemical composition of the interfering materials lying between the formation sample and the detectors.

Abstract: This specification is directed to a method of forming a glass sheet with a ceramic paint thereon, the method having the following steps. A ceramic paint is applied to the glass sheet. The ceramic paint includes normal ceramic paint components along with, as a new component thereof, a metal oxide having at least a low valence oxidation state and a high valence oxidation state. The metal oxide is in its low valence state when applied in the ceramic paint to the glass sheet. The glass sheet is heated to a temperature which softens the glass sheet sufficiently so that the glass sheet can be formed. The glass sheet and the ceramic paint thereon are engaged with a fiberglass covered forming die to form the heated glass sheet to a desired shape. The forming die is removed from engagement with the glass sheet. The metal oxide addition to the ceramic paint in its low valence state is credited with being effective to prevent sticking of any of the ceramic paint to the forming die.

Abstract: An external gauge carrier for use in tubing-conveyed drill stem testing comprises a protective housing for locating and securing the pressure measuring and recording system. The gauge carrier may be manufactured from drill collar bar stock but provides a 1--1 interface with ordinary drill pipe, other measurement subs, perforating guns and the like; i.e., to the complete system it "looks" like a drill collar. The gauge measures and records drill stem bore pressure while providing "full bore" testing capabilities, i.e., the gauge carrier allows unimpeded wireline operation therethrough and causes essentially no pressure drop throughout its length. Special machining and gauge placement is required in order to provide the above capabilities and features while still maintaining sufficient wall thickness to ensure structural integrity. A unique system for protecting the relatively delicate gauges from damage due to shocks from pressure surges is also disclosed.

Abstract: This specification teaches a method of making a special purity alpha silicon nitride powder which is free from halogen-containing and metal-containing compounds as trace constituents. The method has the following steps. Tetraethyl orthosilicate (TEOS) is prepared of requisite purity. A fine mist of the TEOS solution is delivered to a heated reaction zone. Ammonia is contacted with the fine mist of TEOS in the reaction zone. A reaction product of this reaction is collected, the reaction product being amorphous silica and carbon black. The reaction product is heated to a temperature in a range of 1300.degree.-1500.degree. C. The heated reaction product is subjected to a nitrogen gas treatment to convert the silica of the reaction product into a special purity alpha silicon nitride powder because of the chemical reactions occurring between the silica, carbon black, and nitrogen. The prepared alpha silicon nitride powder is then recovered.

Abstract: Determination of drilling mud thermal conductivity for estimation of earth formation temperature through a well bore thermal model. Borehole annulus and drill pipe bore temperature measurements are taken over a relatively short period of time when circulation of drilling mud is interrupted and temperature differentials maximized. The dynamic temperature response characteristics related to the heat transfer and storage parameters of the drill pipe, mud and bit are integrated into a mathematical borehole model incorporating the thermal resistance, heat capacity, and heat generation of the mud and drill pipe and the drill bit. The maximum temperature differential is then determined and the response characteristics used to establish the requisite parameters for the thermal conductivity and temperature calculations. In this manner, formation temperatures can be estimated to monitor downhole mud behaviour and geothermal gradients.