Carbonless transfer sheets for multi-part forms packs
CA 1296897 C · Owner: Weinstein, Philip M. · Inventors: Weinstein, Philip M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Pressure sensitive carbonless transfer sheets are made capable of producing clear images by light impact marking means in multi-part carbonless forms packs containing at least six of the sheets such as 8-12 sheets, by coating a chromogenic material onto a paper sheet characterized by a basis weight of 9-12 lbs, a thickness of 40-50 microns a Gurley, porosity of 400-4000 seconds and a Bendtsen smooth-, ness of 90-260 ml/min on the wire side and 60-280 ml/min on the felt side. Bar codes are also transferrable with good scannability through forms packs containing three or more of the sheets.
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
- Granted March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 2009.
- 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.