Porous hollow silica-rich fibers and method of producing same
CA 1290572 C · Owner: Ppg Industries, Inc. · Inventors: Beaver, Richard P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Porous, hollow silica-rich fibers with good alkaline tolerance are produced from hollow glass fibers of an alkali metal borosilicate glass having one or more oxides of a metal of Group IV of the Periodic Table in an amount of about 1 to about 20 weight percent of the glass composition. The hollow porous silica-rich fibers are produced by acid leaching where the hollow glass fibers have greater than 25 weight percent extractable components, less than 25 weight percent extractable components but a wall thickness of less than 15 microns or less than 25, weight percent extractable components and a fiber diameter of less than 25 microns. In addition, heat treating can be used for hollow glass …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted October 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2008.
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Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.