Titanium dioxide pressed articles, a method of manufacturing them, and use thereof
CA 2040792 C · Owner: Ohmer, Johannes · Inventors: Schwarz, Rudolf; Foerster, Martin; Brand, Reinhold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Manufacturing of titanium dioxide pressed articles wherein pyrogenically produced titanium dioxide in the presence of completely demineralized water is intensively mixed with a wetting agent and/or a base and/or, optionally a binder, and/or, optionally, a shaping adjuvant and/or optionally, an, expanding agent, the resulting material is extruded into moulded members at pressures between 5 and 100 bar and the, moulded members are dried at temperatures between 50 and 120°C and then calcined in atmospheric air at temperatures of 400 to 700°C for 1 to 5 hours.
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 April 18, 1991 and granted March 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 2013.
- 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.