Adhesive polyethylene oxide hydrogel sheet and its production
CA 1300079 C · Owner: Nepera, Inc. · Inventors: Essmyer, John L.; Keusch, Preston
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
ADHESIVE POLYETHYLENE OXIDE HYDROGEL SHEET AND ITS PRODUCTION", Abstract of the Disclosure A solid sheet of adhesive hydrophilic gel which is a homogeneous aqueous mixture, substantially free of unbound water, monomers and crosslinking agents con-, sisting essentially of an amount dispersed uniformly in water of from about 4 to 35 wt% of a crosslinked polyethylene oxide, effective to form with the water a tacky surfaced viscoelastic solid which sheet of hydrophilic gel is produced by subjecting a liquid film of an aqueous solution having a viscosity of about 2-2,000 x 103 cps of a linear water soluble polyethylene oxide having a weight average molecular weight from about 0.02-6 x 106 …
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 May 5, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 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.