Abstract: A dry pressing and slip casting process is provided for the manufacture of glass-ceramic components of the type used in sensors. Both process on starts with a powder composition of SiO2 (42-59 wt. %), Al2O3 (17-35 wt. %), MgO (2-25 wt. %) and also BaO (0-20 wt. %), TiO2 (0-12 wt. %), ZnO (0-10 wt. %), CaO (0-10 wt. %), B2O3 (0-5 wt %), P2O5 (0-5 wt. %), ZrO2 (0-5 wt. %), alkali oxides such as K2O, Na2O (0-3 wt. %) and other small amounts (0-1 wt. %) of additives such as Fe2O3, As2O3. Fe2O3, V2O5, As2O3. Some of the ingredients (e.g. Mg, Ba, Ca) can also be present in the form of fluoride, e.g., MgF2, BaF2, CaF2, to up to 10 wt. %. Additional ceramic additives up to 30 wt. %, which are as second phase (e.g., Al2O3, Y2O3 doped ZrO2, SiO2, mullite, zircon, carbides, nitrides, and a combination of the above), are not part of the glass composition, but are introduced to enhance both the mechanical strength and toughness and to further modify the coefficient of thermal expansion.

Abstract: A capacitive pressure sensor capsule having a support base with a cavity is provided. The capsule includes a housing having a ceramic cover sealingly attached to a ceramic base to define an interior chamber. The base has a cavity facing this interior chamber and at least one hole adjacent the cavity that extends through the base. A glass sensor has a first diaphragm with a first electrode and a second diaphragm with a second electrode bonded together to form a capacitor and is mounted in the chamber so that one of the diaphragms is received within the cavity and the other diaphragm lies on the surface of the base and covers the hole. A conducting member extends from the sensor, through the hole to electronic circuitry mounted to the capsule. The cavity also has a land for supporting the diaphragm disposed therein.

Abstract: A capacitive pressure sensor capsule has a housing with a ceramic cover sealingly attached to a ceramic base that defines an interior chamber. The sensing medium enters the chamber through an inlet port. A glass sensor is attached to an integral pillar that extends from the housing into the chamber. A conducting member extends through the pillar into the housing and carries the signals from the sensor. The combination of the glass sensor and ceramic housing provides high accuracy over a wide range of temperature, because the thermal coefficient of expansion of glass and ceramic are similar. Hermetic sealing of the sensor electrical circuitry ensures long term immunity from the sensed environment.

Abstract: The present provides a method for making glass pressure sensors in batch. First glass plates of appropriate dimensions are scribed. Then electrodes are sputters onto each of the plates, followed by screen printing a frit layer and crossover tabs. The plates are then preglazed and bonded together to form a plurality of sensors. The plates are then scribed and broken along the scribes to form individual sensors.

Abstract: The capacitance type pressure transducer is disclosed which includes an isolation additional diaphragm made of the same material as the operative diaphragms the transducer. Material may be quartz, silicon, or aluminosilicate. The isolation diaphragm minimizes deflections of the operative diaphragms as the housing base is bowed due to the pressure differential between the internal reference pressure of the capsule and the ambient pressure. The transducer may be configured to measure an absolute pressure or a differential pressure.

Abstract: A capacitive pressure transducer is made of aluminosilicate glass or any other glass having a low thermal coefficient.

Abstract: An electronic color filter system for controlling a picture element color signal includes three filter regions which selectively control spectral components of light transmitted sequentially therethrough. Each filter region has a liquid crystal host material and a dye guest component. The orientation of the liquid crystal host, determined by an electric field applied to the filter material, determines the absorption coefficient of the dye guest component to polarized light. By appropriate selection of the guest dye component and control of the electric fields applied to the host liquid crystal, the transmitted light can have a selected radiation spectrum. The transmitted light of a multiplicity of picture elements can be used to provide a full-color visual image display.

Abstract: A liquid crystal display is described that includes gray scale capability. Each pixel of the display is subdivided into a plurality of subpixels. Each subpixel includes an effective capacitor, with the liquid crystal material contained between the effective capacitor plates, and includes a control capacitor coupled in series with the effective capacitor. By controlling the capacitance of the control capacitors of the subpixels, selected subpixels can be activated as a function of the voltage applied across the series capacitors. By controlling the number of subpixels that are activated by the applied voltage, a gray scale capability can be provided for a liquid crystal display.

Abstract: A process for generating high resolution conductive patterns on an insulating substrate. A photosensitive resin coating applied to the surface of a substrate is exposed to a suitable light source through a mask. The unexposed portion of the coating defines the desired conductive pattern which is then coated with a low temperature melting glass powder. The substrate is fired to sinter the glass pattern and fuse it to the substrate. The substrate is then coated with a slurry of fine metal particles suspended in a volatilizable carrier. The substrate is again fired to sinter the metal into a united mass and causing it to fuse only with the low temperature melting glass pattern. The unadhered portions of the metal coating are removed by a washing operation. An exclusively metallic layer is thereby formed on a high resolution glass pattern intermediate layer supported by the substrate.

Abstract: A method of constructing a gas discharge display device in such a manner that contaminants found within the completed display are significantly reduced. The process for assembly of the display incorporates the utilization of a spacer member having a higher melting temperature than the display's perimeter seal and is designed to hold the plates apart without letting certain portions of the sealing material contact the opposing substrate. The use of the spacer member of high temperature material permits a higher temperature to be achieved in the vacuum furnace for evacuating the contaminants produced by out-gassing of impurities in the dielectric and conductive materials as well as the glass substrates and the sealing material. The sealing time for the display after evacuation is shortened to prevent or greatly reduce the possible entrapment of impurities in the display during the higher temperature final sealing step.