Glass fiber compositions
CA 1045641 A · Owner: Ppg Industries, Inc. · Inventors: Hunia, Edward M.; Neely, Homer E. (Jr.); Burgman, Jerome A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Glass fibers having high tensile strength in excess of 570,000 pounds per square inch containing carefully selected quantities of SiO2, A12O3, MgO, CaO, TiO2, B2O3, Na2O BaO and Li2O are disclosed. The glass fibres contain 53 to 57.3 percent by weight as SiO2 16.3 to, 18.5 percent by weight as Al2O3 6.6 to 10.5 percent by weight as MgO, 8.5 to 12.7 percent by weight as CaO,0.6 to 0.8 percent by weight as TiO2, 2.0 to 4.1 percent by weight as B2O3 0.8 to 3.3.percent by, weight as Na2O, 0.0 to 4.1 percent by weight as BaO and 0.0 to 1.0 percent by weight as Li2O. The glasses from which the fibres are made have softening points below 1,650°F and liquidus temperatures below 2210°F.
Read the whole patent
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 January 2, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
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.