Substituted cyclic and heterocyclic methane sulfonates
CA 1191146 A · Owner: Mobil Oil Corporation · Inventors: Schmitt, Kirk D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel substituted cyclic and heterocyclic methane sulfonates are described which may be employed in chemical waterflooding and as sacrificial agents in enhanced oil recovery. They typically have the formula The hetero-substituents X may be O, S, R2N , and , and R1, R2, R3 and R4 are the same or different substituted or unsubstituted, and are hydrogen alkyl, or aryl. Optionally the hetero-substituent may be replaced by , . The compounds may be prepared by reacting X(CH2CH=CHR)2, where X is the above mentioned heterosubstituents or , with a bisulfite salt.
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 July 30, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 30, 2002.
- 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.