Friction core holder
CA 2008309 C · Owner: Randolph, Glenn Edgar · Inventors: Randolph, Glenn Edgar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A core holder for a winding apparatus for winding webs of material in the paper, printing, and textile industries including a rotatable core-receiving spindle or mandrel and a, segmented friction core holder, expandable outwardly at selected paints, by which the core is tightly gripped when the mandrel is turning, and which readily releases its grip on the mandrel upon a simple manual maneuver by the operator and is readily , removable with little force. The pore holder assembly ie round but, the mandrel-receiving hole has segmented arcs which are not concentric with the outer surface of the core holder creating steps, which limit the movement of the segments about the mandrel.
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 January 23, 1990 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2012.
- 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.