Lead-free and cadmium-free glass frit compositions for glazing, enameling and decorating
CA 1232619 A · Owner: Owens-Illinois, Inc. · Inventors: Stewart, Daniel R.; Horn, Uriah; Francel, Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Glass frit compositions are shown that are lead-free cadmium-free, and zinc-free, the compositions having improved chemical resistance, especially acid resistance (acetic acid) of a loss of generally less than about 1.9% by weight. The compositions contain B2O3, SiO2, ZrO2 and rare earth oxides the weight ratio of ZrO2 to rare earth oxides being critical and being about 1/1 to 1.4/1.
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 February 9, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 9, 2005.
- 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.