Abstract: Process and apparatus for the growth of films of silicides of refractory metals and films obtained by this process.According to the invention, in order to grow a silicide film of a refractory metal on a silicon substrate, the latter is cleaned, then thermally degassed under an ultra-high vacuum by bringing the substrate to a given temperature between approximately 600.degree. C. and approximately 800.degree. C. A refractory metal is then evaporated on to the substrate at said temperature, after which the temperature is progressively lowered.Application to the production of electronic microcomponents.
Type:
Grant
Filed:
August 6, 1985
Date of Patent:
February 17, 1987
Inventors:
Francois Arnaud D'Avitaya, Yves Campidelli, Roland Pantel
Abstract: A chemical vapor deposition wafer boat for supporting a plurality of wafers in an evenly spaced, upright orientation perpendicular to the axis of the boat comprises a cylinder having closed ends and comprised of mutually engaging upper and lower hemicylinders. The upper hemicylinder has diffusion zones with gas flow passageways therein in the ends and zones within from 0 to 75 and within from 0 to 15 degrees from a vertical plane through the cylinder axis. The remainder of the hemicylinder wall and the ends are baffle areas without gas flow passageways. The ends and sidewall of the lower hemicylinder comprise gas diffusion zones. The gas flow passageways comprise from 0.5 to 80 percent of the surface area of the respective gas diffusion zones.
Abstract: An improved method for coating a semiconductor wafer with a uniform layer of photoresist or other liquid film is provided. The liquid is first semi-uniformly deposited on the wafer by spraying or otherwise. Thereafter, the wafer is rotated about an axis perpendicular to the plane of the wafer and removed from the wafer. In the preferred embodiment, a number of wafers are placed about the perimeter of a large, flat disc which is rotated about its center. The liquid is spread over the surface of each wafer by the centrifugal force generated by such rotation. By placing the wafers at a distance from the axis of rotation, the centrifugal force on all points of each wafer is approximately the same, thereby providing for a uniform spreading of the film over the wafer.
Abstract: A substrate is prepared for subsequent electroless deposition of a metal by contacting the substrate with a surfactant and with an organic carboxylic acid, and subsequently contacting the substrate with sulfuric acid.
Type:
Grant
Filed:
May 6, 1985
Date of Patent:
January 27, 1987
Assignee:
International Business Machines Corporation
Inventors:
William J. Amelio, David W. Hume, Donald G. McBride, Robert G. Rickert
Abstract: An electroless plating bath for forming a nickel-phosphorus alloy coating having a high phosphorus content contains in water nickel ions, hypophosphite as a reducing agent for nickel ions, a pH adjustor, a pH buffering agent, a small amount of a stress reducing agent and tri(alkali metal) N-(2-hydroxyethyl)ethylenediamine-N, N', N'-triacetate as a first phosphorus deposition promotor. It may further contain at least one sulfate selected from ammonium sulfate, lithium sulfate, potassium sulfate and sodium sulfate as a second phosphorus deposition promotor.
Abstract: A low temperature, low encroachment isolation technique using differential oxidation results in an isolated semiconductor body having an N+ substrate (12) and an N epi layer (14) forming a mesa. N+ implants (22a) and (22b) are implanted on opposite sides of the mesa. Oxide is grown over the surface of the device with differential oxidation thus resulting in thick regions (24) over the N+ dopant regions and a thin region (26) over the undopant mesa region.
Abstract: A solder paste dispensing assembly provides for the controlled application of a predetermined solder paste pattern to a surface. The surface can be on a printed circuit board, prior to or after the board is mounted onto an assembled product or it can be a portion of the product itself. The surface can be a planar or non-planar surface.
Abstract: Encapsulated lithium including a shot shaped and sized body (10) of lithium metal encapsulated in a thin layer (12) of a predominantly fluorine substituted polyolefin based polymeric material, a method of making the same and a power plant utilizing the encapsulated lithium as fuel (FIG. 3).
Abstract: A paste of a glazing composition is coated on the entire surface of a ceramic substrate having a metallized metal portion, and the paste-coated ceramic substrate is sintered in a reducing atmosphere, and a glazing layer is formed on the entire surface of the metallized metal portion by utilizing the repellency of the melt of the glazing composition to the metallized metal portion. A glazing composition comprising SiO.sub.2, B.sub.2 O.sub.3, BaO, Al.sub.2 O.sub.3 and an alkali metal oxide or a glazing composition comprising SiO.sub.2, BaO, Al.sub.2 O.sub.3, CaO and MgO or SrO is used. An acrylic resin syrup, especially an isobutyl methacrylate resin syrup, is used as a binder of a coating paste for forming a glazing layer.
Abstract: An electrochromic element having an electrochromic layer, formed of cobalt hydroxide or cobalt carbonate as a material for evaporation, and interposed between first and second electrodes, each being made of an electrically conductive film.
Abstract: Polyalloy catalytic coating formulations are used for preparing a metallic substrate surface to enhance subsequent plating thereover of nickel, cobalt or polyalloys including nickel or cobalt. At the same time, these catalytic formulations can be rinsed subsequent to their application onto the substrate and prior to the electroless deposition thereover. Improved products such as printed wiring boards may be made with these catalytic formulations. Such boards are prepared by depositing metal and forming circuitry patterns by using resists, etching techniques and the like which typically leave copper specks on the non-conductive board.
Abstract: A sharp imaging, non-smearing system for latent imaging and subsequent visual development of printed text or the like is provided which can be used on a variety of substrates (e.g., paper, metal, cloth, synthetic resins) and is extremely stable and easy to use. The system involves first imaging a substrate with an invisible ink containing a dissociable transition metal salt such as CuSO.sub.4, with subsequent application of a liquid developer containing a solubilized color precursor such as thiooxalic amide which complexes with dissociated transition metal ion to give a sharp, virtually instantaneously developing, long lasting color. Depending upon the metal salt selected, different colors can be obtained upon development. The system of the invention can be used in a variety of contexts, such as in self-testing materials or novelty items.
Abstract: A process for producing coherent films of polyactylene is disclosed. A support is contacted with a catalyst comprising an acidic, polar medium containing a transition metal salt, water and a borohydride. The support is then contacted with acetylene gas which forms on the support a coherent film of polyacetylene strongly adherent to the support.
Abstract: A check paper is being described which is protected against falsifications and forgeries. Crushable micro capsules are being embedded in check paper which contain on one hand a leuco ink and on the other hand a color acceptor. The color acceptor can also be stored in the body of the paper without the use of micro capsules. The leuco ink and the color acceptor react together under color development or color changes if the micro capsules burst through imprinting or other local pressure application to the paper surface. Thus, a character written on the paper surface becomes visible within the body of the paper and cannot be forged anymore.
Type:
Grant
Filed:
April 30, 1984
Date of Patent:
December 16, 1986
Assignee:
GAO Gesellschaft Fuer Automation und Organisation mbH
Abstract: An optically immersed infra-red detector assembly comprises a planar sapphire substrate bearing a detector with radially disposed lens contact pads. The detector and contact pads are produced by etching a single portion of cadmium mercury telluride and have mutually coplanar surfaces. A hemispherical silicon optical immersion lens is bonded to the pads by applying dilute adhesive to lens-pad interfaces. Capillary attraction draws the adhesive between the lens and the pads to form very thin layers of adhesive after solvent evaporation. The adhesive layers ensure that an air gap is produced between the lens and detector, the gap being much smaller than the infra-red wavelength of interest as required to ensure optical immersion of the detector by the lens.
Type:
Grant
Filed:
December 6, 1983
Date of Patent:
December 16, 1986
Assignee:
The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
Inventors:
Ian C. Carmichael, David J. Wilson, Anthony B. Dean
Abstract: An improved alkaline permanganate composition for etching printed circuit boards is provided by incorporating a secondary oxidant in the solution capable of oxidizing manganate ion to permanganate ion.
Type:
Grant
Filed:
October 28, 1985
Date of Patent:
December 16, 1986
Assignee:
Enthone, Incorporated
Inventors:
Constantine I. Courduvelis, Anthony R. Del Gobbo
Abstract: A low cost sheet material, and a method of preparing same, which is useful as a substrate for casting sealants and adhesives. The substrate comprises a highly calendered, smooth grade kraft paper having a coating of an elastomer modified polyvinyl chloride on each of the major surfaces thereof. Either one, or both, of the polyvinyl coatings are provided with a film of a release agent thereon.
Type:
Grant
Filed:
June 3, 1985
Date of Patent:
December 16, 1986
Assignee:
Daubert Coated Products Inc.
Inventors:
Raymond T. Coughlan, Suzette M. Bojarski
Abstract: A process for removing organic materials from an article formed from a slurry of glass and/or ceramic particles, resin binder, and a solvent for the resin binder, the process involving including in the slurry a particulate catalyst selected from the group consisting of Cu, Cu.sub.2 O, CuO, Cu.sub.2 SO.sub.4, CuCl.sub.2, Cu organometallic compounds, and mixtures thereof, the catalyst promoting a rapid and complete removal from the shaped article when heated of the organic materials of the slurry.
Type:
Grant
Filed:
August 2, 1985
Date of Patent:
December 9, 1986
Assignee:
International Business Machines Corporation
Inventors:
Lester W. Herron, Ananda H. Kumar, Raj N. Master, Robert W. Nufer
Abstract: Processes for the production of filter elements based on aromatic polyamide in which a semi-finished filter element is produced from a solution of the polyamide in aprotic solvent and the polyamide is then coagulated by immersion in a liquid bath containing precipitating agent may be used for the production of filter elements with a pore size of from 0.05 .mu.m to 10 .mu.
Type:
Grant
Filed:
November 21, 1984
Date of Patent:
December 9, 1986
Assignee:
Seitz-Filter-Werke Theo & Geo Seitz GmbH & Co.
Inventors:
Charles T. Badenhop, Anna-Luise Bourguignon, Joachim Fischer
Abstract: Passivation, alpha protection and other relatively thick, patterned layers are applied to semiconductor wafers by a screen printing method. Patterned emulsions carried on fine mesh stainless steel screens are tempered at elevated temperatures to harden the emulsion. The screens so prepared withstand many cycles of printing and cleaning with harsh solvents present in screenable polymers such as polyimide and rigid silicone.