Wet pressed paper web and method of making the same
CA 2178586 C · Owner: Sawdai, Albert Heskel · Inventors: Sawdai, Albert Heskel; Ampulski, Robert Stanley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present disclosure provides a wet, pressed paper web (120B 120C). The web, has a first relatively high density region (1083) having a first thickness K, a second relatively low density region (1084) having a second thickness P, which is a local maximum, and a third region (1074) extending intermediate the first and second regions. The third region (1074) includes a transition region (1073) having a third thickness T, which is a local minimum. The present disclosure also provides a method of making a wet pressed web. An embryonic web (120) of papermaking fibers is formed on a foraminous forming member (11), and transferred to a foraminous imprinting member (219) to deflect a portion of …
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 December 19, 1994 and granted July 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2016.
- 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.