Improvements relating to apparatus for forming scrolls from strip material
CA 2118947 C · Owner: Beecher, Roy · Inventors: Beecher, Roy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides that a former (A B, C) is used for forming scrolls from strip metal (30). The former has a scroll flight which is in two parts (A,B) which are relatively movable in the direction of the axis about which the former (A, B C) rotates, to coil the strip (30) about said flight (A B) by, drawing it radially into the former. In the first stage of the process the strip (30) is coiled about the inner part (A) of the flight, the outer part (B) being held displaced axially so as not to interfere with the initial coiling by the strip (30), until the strip (30) clears the end of the outer part (B) of the flight which then moves into the plane of the inner part (A) of the flight …
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 July 24, 1992 and granted December 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2014.
- 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.