Method of attaching a spiral welded roof on a hopper car
CA 2736618 C · Owner: American Railcar Industries, Inc. · Inventors: Shaner, Robert; Coughlin, Steve; Williams, Mike
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for attaching a spiral welded roof on a hopper car including a plurality of , bulkheads and a plurality of sidewalls is provided. The method includes the step of , positioning the spiral welded roof over the bulkheads and extending over the sidewalls and the step of welding the spiral welded roof to the bulkheads and the , sidewalls.
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 December 27, 2001 and granted November 26, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 27, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2023.
- 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.