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United States Utility Patents
4,540,620 - 4,540,629

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NumberTitle
4,540,620 Conductive patterns in polymeric films
4,540,621 Dielectric substrates comprising cordierite and method of forming the same
4,540,622 Flexible, transparent pane for use as a window
4,540,623 Coextruded multi-layered articles
4,540,624 Antistatic laminates containing long carbon fibers
4,540,625 Flexible air permeable non-woven fabric filters
4,540,626 Polyhydroxyalkyl polycarbonamides for the production of flame-resistant polyurethane rigid foams and integral foams
4,540,627 Magnetic recording medium
4,540,628 Hydrophilic sheet and method of making
4,540,629 Hollow microspheres with organosilicon-silicate walls



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