Neutral, ultraviolet absorbing, fixed tint glasses
CA 2108587 C · Owner: Corning Incorporated · Inventors: Morgan, David W.; Kerko, David J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transparent glass which, at a thickness of 2 mm does not transmit more than about 1% of ultraviolet radiation at a wavelength of 380 nm and exhibits a neutral gray, fixed tint bounded by apices A, B C, D, A of the, drawing, a purity no higher than 6 and a luminous, transmittance between 10-16 said glass having a composition, consisting essentially expressed in terms of weight, percent on the oxide basis of, SiO2 65-72 CaO 0-1.5, B2O3 2-6 Al2O3+caO 0.2-2.25 Na2O 6-10 AS2O3 0-0.3, K2O 10-16 Fe2O3 4.8-6.2 Na2O+K2O 17-23 CO3O4 0.012-0.02, K2O:Na2O 1.25-2.25 NiO 0.16-0.21 A12O3 0-2.25 ZnO 0-1.5.
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 October 18, 1993 and granted December 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2015.
- 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.