Process for preparing regulated molecular weight perfluoropolyethershaving neutral and functional end groups
CA 1305494 C · Owner: Montedison S.P.A. · Inventors: Marchionni, Giuseppe; Tasca, Adriana; Caporiccio, Gerardo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
T. 3466 + T. 3470, "PROCESS FOR PREPARING REGULATED MOLECULAR WEIGHT PERFLUORO- POLYETHERS HAVING NEUTRAL AND FUNCTIONAL END GROUPS" ABSTRACT OF DISCLOSURE, A process for the dissociation of high molecular weight perfluoropolyethers to obtain low molecular weight perfluoropolyethers which comprises treating a perfluoropolyether with 0.1 - 10% by weight of a catalyst consisting of Ti Cr, Mn, Fe, Co, Ni, V, Cu, Mo, Sn, Sb, Zr Zn oxides at temperatures comprised, between 150° and 380°C.
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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 July 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 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.