Abstract: A process for fabricating a gas impermeable seal on a porous ceramic surface using a thin, glass-based, pinhole free glaze. The process can be used to fabricate gas impermeable end seals on porous alumina tubes used as filter media. The porous alumina tubes can have an inorganic microporous thin film separation membrane on the inner surface, which can be used for high temperature gas separation processes.

Abstract: A trim attachment and method comprises a door lever/knob which is assembled to a spindle housing of a lock assembly by sliding the door lever/knob over the spindle. A retaining mechanism within the door lever/knob automatically engages the spindle to couple the door lever/knob to the spindle when the door lever/knob is properly positioned on the spindle. The spindle and door lever/knob have mating exterior and interior ribs providing torque transfer between the spindle and door lever/knob. An aperture is provided in the door lever/knob to depress a portion of the retaining mechanism to release the retaining mechanism, allowing the door lever/knob to be removed. The improved knob/lever trim attachment and methods provide an easily assembled and manufactured, aesthetically pleasing, and easily replaceable assembly for a door lock assembly.

Abstract: A trim attachment and method comprises a door lever/knob which is assembled to a spindle housing of a lock assembly by sliding the door lever/knob over the spindle. A retaining mechanism within the door lever/knob automatically engages the spindle to couple the door lever/knob to the spindle when the door lever/knob is properly positioned on the spindle. The spindle and door lever/knob have mating exterior and interior ribs providing torque transfer between the spindle and door lever/knob. An aperture is provided in the door lever/knob to depress a portion of the retaining mechanism to release the retaining mechanism, allowing the door lever/knob to be removed. The improved knob/lever trim attachment and methods provide an easily assembled and manufactured, aesthetically pleasing, and easily replaceable assembly for a door lock assembly.

Abstract: A glass ceramic composition, a glass ceramic-to-metal seal, and more specifically a hermetic glass ceramic-to-metal seal prepared by subjecting a glass composition comprising, by weight percent, SiO.sub.2 (65-80%), LiO.sub.2 (8-16%), Al.sub.2 O.sub.3 (2-8%), K.sub.2 O (1-8%), P.sub.2 O.sub.5 (1-5%), B.sub.2 O.sub.3 (0.5-7%), and ZnO (0-5%) to the following processing steps: 1) heating the glass composition in a belt furnace to a temperature sufficient to melt the glass and crystallize lithium phosphate, 2) holding at a temperature and for a time sufficient to create cristobalite nuclei, 3) cooling at a controlled rate and to a temperature to cause crystallization of lithium silicates and growth of cristobalite, and 4) still further cooling in stages to ambient temperature. This process produces a glass ceramic whose high coefficient of thermal expansion (up to 200.times.10.sup.-7 in/in/.degree.C.