Metal hydride cells having improved cycle life and charge retention
CA 2117748 C · Owner: Fetcenko, Michael A. · Inventors: Fetcenko, Michael A.; Ovshinsky, Stanford R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rechargeable hydrogen storage cell comprising a negative electrode having the composition: (Ovonic Base Alloy)aMb where Ovonic Base Alloy represents an Ovonic alloy that contains 0.1 to 60 atomic percent Ti 0.1 to 25 atomic percent Zr, 0.1 to, 60 atomic percent V 0.1 to 57 atomic percent Ni, and 0.1 to 56 atomic percent Cr as described above; a is at least 70 atomic per cent; M represents at least one modifier chosen from the group consisting of Co Mn, Al, Fe, W, La, Mo, Cu, Mg, Ca, Nb, Si and, Hf; b is 0 to 30 atomic percent; b > 0; and a + b = 100 atomic percent; a positive electrode; and a separator of electrolyte retentive nylon or wettable polypropylene.
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 5, 1993 and granted March 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 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.