Preparation of laminated structures by thermoforming
CA 1303951 C · Owner: Lee, Walter J. · Inventors: Hissem, Catherine S.; Lee, Walter J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Thermoplastic layers are vacuum thermoformed to produce laminated structures by perforating all layers to be formed except the layer outermost from the mold. Thus the non-perforated layer is attracted to the mold serving as a diaphragm for the other layers or consolidating therewith to form the desired article.
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
- Granted June 23, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 23, 2009.
- 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.