Tubular core assemblies for rolls of paper or other sheet material
CA 2248951 C · Owner: Kewin, Daniel D. · Inventors: Kewin, Daniel D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An annular end member (14) of plastic material for insertion into an end portion of a hollow cylindrical core member (12) of a tubular core assembly for a roll of paper or other sheet material has an outer annular surface securable to an inner annular surface of the core member (12) and an inner annular surface shaped to receive a roll supporting chuck. A radiallyprojecting lug (18) adjacent an end of the end members (14) is engageable in a lug-receiving notch (20) in the core member (12) and a plurality of , circumferentially - spaced axially - extending channels (22) are provided in the inner annular surface of the end member (14) to receive radially outwardly movable portions of a …
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 April 2, 1997 and granted February 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2019.
- 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.