Improvements in corrugated paperboard machinery
CA 2248652 A1 · Owner: Shaw, Neil William · Inventors: Shaw, Neil William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paperboard corrugating machine for forming board having two corrugated mediums joined at their flute tips without any intervening liner. The machine comprises a frame (11) thicker than conventional frames mounted on which is a , second frame (12). Frame (11) carries two rolls (13 and 14) and frame (12) carries two rolls (15 and 16). Frame (12) can be locked into position and loaded against the upper roll (13). The four rolls (13 14, 15 and 16) lie in , a single plane. By using one frame to mount all four rolls (13 14, 15, 16) , and including one pair of rolls (15 16) on a second frame (12) mounted on the first frame to form a cassette, movement and twisting of the rolls (13 and 15) …
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 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.