Method and material for protecting glass surfaces
CA 2179020 A1 · Owner: Robbins, J. David · Inventors: Parsons, Alice B.; Heater, Kenneth J.; Mccurdy, Richard J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and material is disclosed for protecting glass surfaces in a stack of glass sheets by applying an interleaving material comprised of a high molecular weight polymer having a number average molecular weight of at least 100,000 to one or both major surfaces of the glass sheets. The glass sheets are then stacked in face-to-face relation for shipment or storage.
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 19, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2016.
- 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.