Preparation of 1,6-dioxa-spiro 2.5 octane
CA 2066517 A1 · Owner: Fischer, Martin · Inventors: Fischer, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
BASF AKTIENQESELLSCHAFT O.Z. 00?0/42432 Preparation of 1,6-dioxa-spiro2.5octane Abstract of the disclosure:, The preparation of 1,6-dioxa-spire2.5octane of formula I (I), by reaction of 4-methylene-tetrahydropyran of formula II (II), with an organic peroxy compound, is carried out by reacting the compound of formula 11 with an organic hydroperoxide in the presence of a carboxylate, alcoholate, or complex compound of titanium vanadium, molybdenum, or tungsten acting as catalyst.
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 April 22, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2014.
- 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.