Valve metal powders and process for producing them
CA 2754650 C · Owner: H.C. Starck Tantalum And Niobium Gmbh · Inventors: Loeffelholz, Josua; Seyeda, Hady; Schnitter, Christoph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve metal powder comprising spherical agglomerates wherein: the D50 , value, determined in accordance with ASTM B 822 is 10-80 µm, and the valve metal , powder flows freely through a Hall-Flow funnel in accordance with ASTM B 212 or B 417 with a , funnel opening diameter of 2/10 inch and the D90 value, determined in , accordance with ASTM B 822 corresponds to at most 1.3 times the D50 value determined in , accordance with , ASTM B 822. An anode body produced from the valve metal powder has a bimodal pore , distribution, a smaller maximum of the pore distribution corresponding to a primary structure , and a larger maximum of the pore distribution corresponding to a secondary …
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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 March 7, 2003 and granted December 31, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 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
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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.