Glass fibres with improved biological compatibility
CA 2017344 C · Owner: Christoph, Geert · Inventors: Christoph, Geert; Nyssen, Peter R.; Wagner, Wolfram
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Glass fibres which are distinguished by either greatly reduced carcinogenicity have an average fibre diameter of <8 µm, preferably ,3µm, with more than 10% of the fibres having a diameter of ,3µm. The types of glass used for producing these fibres are characterised by containing the following compounds in the proportions shown in mol-%:, 55-70 % SiO2, 0-5 % B2O3 0-3 % Al2O3, 0-6 % TiO2, 0-2 % iron oxides 0-5 % MgO, 8-24 % CaO, 10-20 % Na2O, 0-5 % K2O and 0-2 % fluoride.
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 May 23, 1990 and granted September 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2012.
- 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.