Aluminium alloy for pressurized hollow articles
CA 2106320 C · Owner: Societe Metallurgique De Gerzat · Inventors: Ehrstrom, Jean-Christophe; Anagnostidis, Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A 7000 series alloy and a specific heat treatment for the manufacture of pressurised hollow bodies and in particular, metallic cylinders for compressed gases. By % weight the alloy contains 6.25 <= Zn <= 8.0~ Mn <= 0.20 1.2 <= Mg <= 2.2 ~ Ti <= 0.05 1.7 <= Cu <= 2.8 0.10 <= Zr <= 0.25. Others each <= 0.05 Fe <= 0.20 ~~ " total <= 0.15 Si+fe <= 0.40 ~~ Remainder: A1. Cr <= 0.05. The final annealing is ideally carried out in 3 stages: 1st stage: between 105 and 120°C for 6 to 12h 2nd stage: between 170 and 190°C for 0.5 to 20h 3rd stage: between 105 and 120°C for 12 to 36h.
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 September 16, 1993 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 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.