Pressure-sensitive adhesives and self-adhesive postage stamps made therewith
CA 2274053 A1 · Owner: Spada, Lon T. · Inventors: Spada, Lon T.; Koch, Carol A.; Alpaugh, Kathleen M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Acrylic, self-adhesive postage stamps are provided and include a flexible facestock bearing an acrylic pressure-sensitive adhesive(PSA) protected by a , release liner. The acrylic PSA is a tackified or inherently tacky polymer formed from a plurality of monomers comprising based on the total weight of , monomeric composition essentially of (i) 9 to 40 % isobornyl acrylate and (ii) 50 to 91 % of one or more alkyl acrylates.
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 December 4, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 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.