Method of working paperboard blanks
CA 2286208 A1 · Owner: Ruthenberg, Meyer L. · Inventors: Larkin, Barry E.; Ruthenberg, Meyer L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of working paperboard blanks (104) is disclosed. The method including providing first and second pairs of parallel rotary shafts (106 121) , supporting first and second pairs of tool heads (119 135) respectively. The , first pair of tool heads (119) is moved to a predetermined longitudinal position along the first pair of shafts (106) to define a first line of working (150). Likewise, the second pair of tool heads (135) is moved to a predetermined longitudinal position along the second pair of shafts (121) to define a second line of working (152) wherein a center of the first line of working (150) is displaced relative to a center of the second line of working (152). The …
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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 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2020.
- 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.