Cleanroom wiper products, and the methods of preparing and using them are described in this patent. The cleanroom wipers are intended for use in cleaning up alkaline contaminants.
The wipers contain impregnated acidic solutions (e.g., solutions of organic acids and optionally solvents), which are intended to reduce or eliminate the possibility of spontaneous combustion when used to contain spills of alkaline products such as hydroxylamine-based products and other caustic-based formulations.
The wipe (A) can be made of knitted, woven or non-woven fabrics and preferably packaged in a liquid- and air-tight sealed bag (B).
Patent number: 6,645,930 B1
Date granted: Nov. 11, 2003
Inventors: Danny L. Wallis and Robert J. Small, of EKC Technology Inc. (Hayward, Calif.)
This invention relates to a dense ceramics having ESD-dissipative characteristics, tunable volume and surface resistivities in semi-insulative range (10.sup.3 -10.sup.11 Ohm-cm).
The ceramics are substantially pore free, of high flexural strength and light in colors for desired ESD dissipation characteristics, structural reliability, high vision recognition, low wear and particulate contamination.
They can be used as ESD dissipating tools, fixtures, load-bearing elements, work surfaces, containers in manufacturing, and assembling electrostatically sensitive microelectronic, electromagnetic, electro-optic components, devices and systems.
Patent number: 6,669,871 B2
Date granted: Dec. 30, 2003
Inventors: Oh-Hun Kwon, Matthew A. Simpson and Roger K. Lin, of Saint-Gobain Ceramics & Plastics (Worcester, Mass.)
The cleanroom wall system uses a universal stud design that allows a variety of wall configurations to be assembled.
The stud (A) is preferably made of extruded aluminum, is rectangular in cross-section, and includes outer walls (B,C,D and E), which are sized to define wide and narrow sides (F).
Slots (G) extend along the length of the stud to interrupt each of the four outer stud walls. Inside each slot, inner walls (H,I) are shaped to form chambers (J), which run continuous with the slots in the opposing wide-sidewalls and taper toward the stud. There, the inner walls are joined at the center of the stud by a web (K) that runs parallel with the wide sides.
That web combined with corrugated surfaces (M,N) and ridges (O) allows the system to use a connector block (not shown) for joining perpendicularly oriented studs, or for splicing together axially aligned studs. A corner stud is also included, as well as a deflection track for connecting the top track of a wall panel to a conventional ceiling grid, allowing deflection of the grid relative to the wall and facilitating easy access to the portion of the ceiling immediately above the wall panel.
Patent number: 6,634,149 B2
Date granted: Oct. 21, 2003
Inventors: Dennis O. Cates, of Tualatin, Ore., and Roger K. Crawford, (Salem, Ore.)