Edge sealer for multi-ply business forms
CA 2028518 A1 · Owner: Hutchinson, Wilbur P. · Inventors: Hutchinson, Wilbur P.; Smith, Gerald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An edge sealer includes a heater anvil having a heater band disposed in a convex configuration and lying opposite a drive belt. Multi-ply business forms are conveyed along the edge sealer with the, edge of the form extending between the belt and the heater band. Application of heat by the heater band to the edge activates the heat-sensitive adhesive to adhesively seal the edges of the plies one to the other without applying heat to the body of the form. A conveyor system transfers forms from one conveyor to another without change of spatial orientation of the forms to pass the unsealed edges of the forms through an additional edge sealing unit downstream of the first edge sealing unit.
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 October 25, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2012.
- 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.