Patterned pressure sensitive adhesive transfer tape
CA 2115673 C · Owner: Minnesota Mining And Manufacturing Company · Inventors: Koskenmaki, David C.; Calhoun, Clyde D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carrier web (11) with recesses (16) therein which contain pressure sensitive adhesive (14). The recesses (16) in the carrier web (11) maintain the adhesive (14) in a discrete pattern during handling and storage and prevent lateral flow of the pressure sensitive adhesive (14) under ambient conditions. The patterned adhesive may be transferred to an article directly from the recesses in the carrier by pressing the article onto the carrier web (11) or indirectly by transferring the adhesive (14) first to a cover sheet or to the flat backside of the web and thence to the article.
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 July 31, 1992 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2014.
- 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.