Abstract: Printed circuits which reside on three dimensional surfaces are disclosed. Using a first technique, a three dimensional surface is formed on a substrate having a high melting point or permitting a high degree of infrared energy transmittance. The surface contains a layer of metalization maintained at a depth of less than two microns. An infrared laser then moves around the surface and selectively vaporizes metalization leaving a desired printed circuit pattern. The remaining metalization is plated to a useable depth. Using a second technique, a fiber optic bundle is machined on one end to mate with the three dimensional surface. The three dimensional surface, metalized and coated with photo resist, resides in intimate contact with this first end. A second end of the cable is flat and resides in intimate contact with two dimensional master photo artwork. A pattern is exposed on the photoresist through the fiber optic bundle, and the metalization is etched using conventional techniques.
June 16, 1986
Date of Patent:
August 16, 1994
James M. Henderson, Vernon R. Scott, Kenneth C. Cote
Abstract: An assembly for use in the production of a relief printing plate comprises a polymeric substrate, a primer layer and a resin layer thereon, the resin layer being at least 2 microns thick and comprising a low molecular weight copolymer of vinyl chloride and vinyl acetate, optionally with a termonomer, particularly a hydroxyl-containing termonomer. The primer layer may contain a vinyl chloride-vinyl acetate copolymer, and the substrate may be a polyester, particularly a polyethylene terephthalate film.
Abstract: A liquid photopolymer layer covering a phototool image surface with one surface exposed to air is exposed by radiation through the phototool to partially harden in a pattern defined by the image the photopolymer layer through a part of its thickness. The air exposed surface portion is thus left in liquid form for contacting the surface of a printed wiring board, preferably by scanning along the length of a phototool with a pressurized roll or blade to contact and adhere the preimaged laminate to board surface in an air bubble free lamination where subsequent radiation exposure finishes the curing and bonds the cured portion of the polymer layer to the PWB substrate. After removal of the phototool, the polymer layer is developed by washing out uncured polymer portions as defined by the image pattern.
Abstract: A photovoltaic laminate of different semiconductor layers for providing a wide range of photovoltaic characteristics. One of the layers is an amorphous semiconductor and at least one other of the layers is of crystalline particles. Additional semiconductor layers, both amorphous and non-amorphous, may be included. The amorphous layers have a thickness of about a few microns and the crystalline layers have a thickness above about 60 microns. The various semiconductor layers can include P, N and intrinsic regions. In accordance with a method aspect of the invention, the particulate layers are produced by blowing a molten semiconductor through a nozzle or by the spin coating of emulsions. The particles are desirably accompanied by a binder in the form of a silicate, an acrylic or a cycloaliphatic epoxy.
Abstract: A method of forming a variable width channel in a body comprises the steps of forming a surface grating having a photoresist layer thereon. The photoresist layer has a plurality of depressions and a planar photomask is then positioned over the photoresist layer. The photoresist layer is subsequently exposed and developed and due to the divergence of light into the depressions covered by the photomask, forms a variable width opening. A portion of the body exposed in the opening is removed to form a channel with a sidewall having a surface contour corresponding to an edge of the opening.
Abstract: A method of preparing ceramic monolithic structures with an internal cavity and passageways is described. A thin sheet of a ceramic material is formed by spreading the material on a glass plate with a doctor blade. Individual sheets of the material are cut or punched to form predetermined holes, channels or various shapes therein. These individual sheets are then stacked to form a layered structure. A supporting media such as paraffin wax is injected into the holes and channels to completely fill them with the media. The layered structure is then pressed by unipressing and/or isostatic pressing followed by a prefiring step to remove the supporting media. Once the supporting media had been completely removed, the layered structure is then sintered to form a monolithic structure containing precise predetermined internal cavity and passageways.
September 28, 1987
Date of Patent:
May 23, 1989
GTE Laboratories Incorporated
Elizabeth A. Trickett, Richard C. Assmus
Abstract: In accordance with the invention, a composition of matter is provided for forming a coating for protecting carbonaceous substrates from degradation at elevated temperatures. The composition of matter is a mixture of particulate silicon, silicon carbide and alumina. The mixture contains between about 40% and 50% silicon by weight of the total composition, between about 30% and 50% silicon carbide by weight of the total composition and between about 20% and 30% alumina by weight of the total composition. A method is provided for forming a primary protective coating on carbonaceous substrates utilizing the aforesaid mixture. An enhancement coating is provided for sealing the primary coating in applications where the substrate will be subjected to elevated temperatures and temperature cycling.
Abstract: A thermal transfer sheet comprising a heat resistive base, a thermally transferable ink layer on one side of the base, and auxiliary particles distributed in the layer so that they partially emerge from the surface of the layer to present an irregular surface. The transferable ink layer comprises a mixture of a coloring agent and a hot melt binder, the mixture being transferable to a writing surface in response to application of heat to the other side of the base to provide continuous tone rendition.
Abstract: A tamper-resistant vessel which contains a liquid is provided with a non-adherent multi-walled construction having, in one embodiment, at least two adjacent non-adherent layers for providing a void in between to enable tamper indication by discoloration indicative of gross spoilage. In one embodiment, the container or vessel has an opaque inner wall and a closely spaced transparent outer wall, with a void in between. Puncture from the outside through the two walls provides seepage of the interiorly-carried liquid between the multiple walls to provide the look of spoilage.
May 20, 1987
Date of Patent:
March 28, 1989
E. Joseph Stillwell, George E. Pickering, Richard E. Merrill
Abstract: There is disclosed a lithographic mask structure including a mask support film, and a support substrate, wherein the peripheral portion of the mask support film is attached on the surface of the support substrate which has a groove.
Abstract: The present direct invention is directed to a sealing glass composite comprising a low melting point sealing glass matrix mixed with a particulate additive to increase the effective coefficient of thermal expansion of the resulting sealing glass composite. The sealing glass matrix is in the lead borate family and the particulate additive is preferably calcium fluoride. The glass composite is particularly useful as a semiconductor package sealant.
Abstract: A recording medium comprises an ink receiving layer provided on a substrate, wherein said ink receiving layer contains a cationically modified product of polyvinyl alcohol and a water soluble polymer having no active hydrogen.
Abstract: An electrode supporting conduit tube for electrical heating of underground hydrocarbon resources comprises a metal conduit tube and an insulating member adhered on and around the outer peripheral surface of the metal conduit tube. The insulating member is a laminated body of a web of glass fiber impregnated with water-dispersion varnish of a hot-water resistant and thermoplastic resin and a polyether/ether/ketone resin film, which is formed by first alternately winding the glass fiber web and the resin film on and around the outer peripheral surface of the metal conduit tube for a plurality of winding turns, and then subjecting both polyether/ether/ketone resin film and glass fiber web thus wound on and around the metal conduit tube to shaping under heat and pressure at a heating temperature of from 350.degree. C. to 450.degree. C, and under a pressure of from 10 kg/cm.sup.2 to 200 kg/cm.sup.2.
Abstract: A method of manufacturing a dielectric material for use in spacecraft, comprising the operation of coating a dielectric substrate with a layer comprising a metal oxide dispersed in a solution of a polymer material of a thickness such that when the polymer solvent has evaporated the resultant layer has a thickness comparable with the expected maximum range of incident electrons.
Abstract: Flexible, long-wearing, water-resistant lip-films are formed from water-based compositions comprising water; an alkali-dispersible or alkali soluble, water-insoluble thermoplastic film forming resin; a volatile base; and a water-insoluble plasticizer.
Abstract: A capped recrystallizable silicon layer covering a substrate is provided with a thin buffer layer between the capping layer and the silicon layer. This recrystallizable silicon layer is then converted to a monocrystalline silicon layer.
Abstract: In an electrostatic recording material being composed of a multi-layered sheet support having an electroconductive layer and a dielectric layer formed successively thereon, the number of projections having a height of 10 .mu.m or more from the flat surface is limited to a maximum of 50 per 0.1 m.sup.2, so that the material has excellent properties and can produce prints of very high quality.
Abstract: A multi-usable pressure-sensitive transfer recording medium wherein a finely porous layer comprising minute porous particles and a binder material for bonding the porous particles to each other is provided on a surface of a foundation, and a liquid ink paste substantially incompatible with the binder material is contained in said finely porous layer. The recording medium is characterized in that said foundation is a plastic film, and said foundation and said finely porous layer are bonded to each other with an adhesive layer composed of a hydroxyl group-containing vinyl chloride-vinyl acetate copolymer cross-linked with an isocyanate compound, in order to make it possible to use the recording medium many times at low temperatures.
Abstract: An apparatus for applying a phototool to a light sensitive substrate by means of a roller for applying the phototool to the substrate and a vacuum restraining means for restraining the phototool to maintain it under tension during application of the phototool to the substrate.
Abstract: The present invention is directed to a ceramic coated metal substrate having improved processibility characteristics in the manufacture of electronic devices, as for example electronic circuits, and to processes for manufacture of such devices.