Bandages containing polyurethane urea gels
CA 1078733 A · Owner: Bayer Aktiengesellschaft · Inventors: Dahm, Manfred; Schapel, Dietmar; Lehnert, Gunther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to the manufacture of novel bandages which are based on stable polyurethane urea gels. The gels are prepared from NCO prepolymers which are obtained, from polyethers which contain at least 40% of ethylene oxide units, and chain extending agents such as water and/or polyamines. The gels may be prepared with perfumes pharmaceutical, preparations and other additives. The bandage is optionally made with supporting, intermediate and/or covering layers.
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 June 3, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 3, 1997.
- 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.