Stack of pressure sensitive adhesive coated sheets
CA 2009157 C · Owner: Minnesota Mining And Manufacturing Company · Inventors: Mertens, Timothy A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stack of aligned sheets each of which sheets, includes a backing a coating of pressure sensitive adhesive on a lower surface of the backing by which the sheet is adhered to the sheet beneath it in the stack which coating, extends along and within at least 12.5 mm of all of the edges of the backing, release means providing a first adhesion zone between adjacent sheets in the stack and adjacent one of the edges of the sheet for providing a sufficiently low release force between the adhesive coating and the upper surface of the adjacent sheet in the stack to afford, when the sheet is the uppermost sheet in the stack easy initiation of peeling of the sheet from the adjacent sheet in the …
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 February 2, 1990 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 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.