Use of a chromium-containing alloy
CA 1307138 C · Owner: Diekmann, Helmut · Inventors: Eichenhofer, Kurt-Wilhelm; Diekmann, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Corrosion of metal in apparatus handling and contacting concentrated sulfuric acid of strength greater than 96% H2SO4 is prevented by fabricating the apparatus from an alloy consisting essentially of 21 to 55% by weight chromium, 0 to 30% by weight iron 0 to 5% by weight tungsten, 45 to 79% by weight nickel and at least one impurity element selected from the group consisting of carbon, silicon, phosphorus sulfur, nitrogen, aluminium, copper, vanadium titanium, tantalum and niobium. LeA 24,615
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
- Granted September 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 2009.
- 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.