Voltage non-linear resistor for gapped lightning arrestors and method of producing the same
CA 2041625 C · Owner: Imai, Osamu · Inventors: Ohira, Kunio; Sato, Ritsu; Imai, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An excellent voltage non-linear resistor for use in a gapped lightning arrestor having a composition containing 1 0.5-1.2 mole % of bismuth oxide calculated as Bi2O3, 2 0.3-1.5 mole % of cobalt oxide calculated as Co2O3, 3 0.2-0.8 mole % of manganese oxide calculated as MnO2, 4 0.5-1.5 mole % of antimony oxide calculated as Sb2O3, 5 0.1-1.5 mole % of chromium oxide calculated as Cr2O3, 6 0.6-2.0 mole % of silicon oxide calculated as SiO2, 7 0.8-2.5 mole % of nickel oxide calculated as NiO, 8 0.004-0.04 mole % of aluminum oxide calculated as Al2O3, 9 0.0001-0.05 mole % of boron oxide calculated as B2O3, 10 0.001-0.05 mole % of silver oxide calculated as Ag2O, and 11 the rest of zinc oxide 12 …
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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 May 1, 1991 and granted August 26, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 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.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.