Method for extruding a plastic member with a roughened surface
CA 2039621 A1 · Owner: Hopperdietzel, Siegfried · Inventors: Hopperdietzel, Siegfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carrier strip for holding labels to a support such as, the edge of a shelf, includes a rear wall which can be attached to the support and a transparent front wall which is connected to the rear wall so as to form a pocket between the walls. The carrier strip is made by extruding a plastic composition at relatively high pressure through a die which incompletely smooths the surface regularities resulting from the relatively high extrusion pressure. This disrupts the longitudinal striations or dielines which are characteristic of extruded members and which might otherwise cause undesirable reflections when a bar code reader is used to read a bar code printed on a label in the pocket. - 1 -
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 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2013.
- 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.