High liquidus viscosity glasses for flat panel displays
CA 2113505 C · Owner: Dumbaugh, William H. Jr. · Inventors: Lapp, Josef C.; Dumbaugh, William H. Jr.; Moffatt, Dawne M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is related to glasses for use as substrates in flat panel display devices: more specifically, for use as substrates in LCDs which utilize polycrystalline silicon thin film transistors. The compositions for the inventive glasses are essentially free from alkali metal oxides and consist essentially in mole, percent, of, SiO2 64-70 Y2O3 0-5 Al2O3 9.5-14 MgO 0-5, B2O3 5-10 CaO 3-13 TiO2 0-5 SrO 0-5.5, Ta2O5 0-5 BaO 2-7, Nb2O5 0-5 MgO+CaO+SrO+BaO 10-20 .
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 January 14, 1994 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 14, 2016.
- 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.