Process for the preparation of molded articles having a compressed peripheral zone and a cellular core, preferably shoe soles
CA 2000019 C · Owner: Reich, Erhard · Inventors: Reich, Erhard; Tintelnot, Dieter; Volkert, Otto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention deals with a process for the preparation of molded articles having a compressed peripheral zone and a cellular core, such as for example, flexible elastic shoe soles having a density of from 0.4 to 1.0 g/cm3 comprising, reacting;, a) organic and/or modified organic polyisocyanates with;, b) at least one higher molecular weight compound having at least reactive hydrogen atoms and with or without; c) lower molecular weight chain extending agents and/or crosslinking agents;, in the presence of d) low boiling point aliphatic and/or cycloaliphatic hydrocarbons having 4-8 carbon atoms in the molecule preferably pentanes as blowing agents;, e) catalysts; and with or without; f) …
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 October 2, 1989 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2011.
- 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.