Apparatus for cutting sheet material
CA 2186358 C · Owner: Sheikh Ghaleb Al Hamad · Inventors: Guthrie, Duncan Richard; Wood, John David; Smith, David William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for slitting or, cutting sheet material comprises a driving roller (10) and a driven, roller (12). Each roller (10 or 12) has on its periphery a plu-, rality of ribs at a predetermined pitch and helix angle. The pitch, of the ribs (18) on the driving roller (10) is smaller than the, pitch of the ribs (30) on the driven roller (12), and the helix, angle of the ribs (18) on the driving roller (10) is of opposite di-, rection to and of smaller mag-, nitude than, the helix angle of the ribs (30) on the driven roller, (12). The ribs (18 30) cooper-, ate to cut with a shearing action a web (16) of sheet material fed, into the nip between the rollers (10 12).
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 27, 1995 and granted September 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2017.
- 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.