Spiral construction for a long nip press belt
CA 2067715 C · Owner: Albany International Corp. · Inventors: Stigberg, Carl E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A belt for use on a long nip press for dewatering a fibrous web may be manufactured by winding an elongated strip onto a pair of process rolls to form a closed helix. Adjacent coils of the closed helix are bound to one another with an adhesive. The elongated strip includes a reinforcing web coated on one side with a uniformly smooth coating of a polymeric resin. The other side of the reinforcing web is coated with another polymeric resin of higher hardness value and is provided with grooves. The elongated strip is wound onto the process rolls to produce a belt with a grooved outer surface. The method facilitates the manufacture of belts of a variety of widths and lengths.
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 30, 1992 and granted March 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2014.
- 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.