Method for manufacturing a laminate having at least one pleated lamina
CA 2020731 C · Owner: Goulait, David John Kenneth · Inventors: Carstens, Jerry Edward; Goulait, David John Kenneth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing a laminate having at least one pleated lamina is disclosed. The method uses an apparatus having two rolls defining a nip, with at least one of the two rolls having circumferentially oriented grooves. The laminae are forwarded through the rolls in face to face relation. One lamina is pleated and the pleats are transversely registered with the circumferential grooves of the grooved roll as the laminae pass through the nip. The laminae may be autogenously or adhesively joined to produce the unitary laminate.
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 July 6, 1990 and granted October 18, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 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.