Paper pulp screen cylinder
CA 2248639 A1 · Owner: Munro, Stephen G. W. · Inventors: Munro, Stephen G. W.; Goldenberg, Philip H.; Gero, William A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plurality of like wedge bars (36) are formed with a groove (46) between two lands (48). The wedge bars (36) are assembled into a cylindrical screen (24) with the grooves (46) defining screening slots (30) of a uniform width. The wedge bars (36) may be electron beam welded or furnace brazed to support rings (44). Alternatively, the wedge bars (36) may be held in place by slots in support rings (44) and circumferential clamping applied by jack wedge assemblies (58). Multiple cylindrical segments (123) may be connected together into a single screen cylinder (24) by an ear (125) and slot (133) arrangement. The screen cylinder so formed may have slots (30) of 0.004 inches or less in …
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 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 2019.
- 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.