Opalescent glass-ceramic product
CA 2466620 C · Owner: Krumbholz, Klaus · Inventors: Krumbholz, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an opalescent glass-ceramic product especially an , opalescent glass-ceramic product as a dental material or as an additive to or component of dental material, comprising at least the components SiO2 Al2O3, P2O5, Na2O, K2O, CaO and Me(IV)O2. In order to obtain improved opalescence with improved transparency, in addition to fluorescence thermal expansion and , a combustion temperature adapted to other materials the opalescent ceramic , product is devoid of ZrO2 and TiO2or is essentially devoid of ZrO2 and TiO2 such that the Me(II)O content in the glass ceramic is less than approximately 4 wt. % and the Me(IV)O2 content amounts to approximately 0.5 - 3 wt. %. The …
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
- Filed June 24, 2003 and granted January 15, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2025.
- 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.