Tools for cold-forming plastics films, particularly polypropylene films of various thicknesses
CA 2091877 A1 · Owner: Muller, Matthaeus · Inventors: Eggert, Heinrich; Schwartz, Hans; Muller, Matthaeus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and process for cold-forming films The specification describes apparatus for the coldforming of plastics films or sheet metal foils particularly polypropylene films, without any previous heat treatment. The apparatus consists of a forming punch 1 with a central inner cavity 8 which is vented to atmosphere by a transverse passage 9, and a perforated die 4 having a hole adapted to receive the forming punch. A film 3 is secured to the perforated die 4 by a clamping member 2 and the forming punch 1 then enters the hole of the perforated die to produce a formed blank 6.
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 March 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2015.
- 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.