Chemical compositions and use as fuel additives
CA 1329624 C · Owner: Tack, Robert Dryden · Inventors: Lewtas, Kenneth; Rossi, Albert; Lehmann, Edwin William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the general formula in which -Y-R2 is SO3(-)(+)NR?R2, -SO3(-)(+)HNR?R2 -SO3(-)(+)H2NR3R2, -SO3(-)(+)H3NR2, -SO2NR3R2 or -SO3R2; -X-R1 is -Y-R2 or -CONR3R1, -CO2(-)(+)NR3R1 CO2(-)(+)HNR3R1, -CO2(-)(+)H2NR3R1, -CO2(-)(+)H3NR1 -R4-COOR1, -NR3COR1, R4OR1, -R4OCOR1, -R4R1 -N(COR3)R1 or Z(-)(+)NR?R1;, -Z(-) is SO3(-) or -CO2(-); R1 and R2 are alkyl, alkoxy alkyl or polyalkoxy alkyl containing at least 10 carbon atoms in the main chain: R3 is hydrocarbyl and each R3 may be the same or different and R4 is nothing or is C1 to C5 alkylene and in the carbon-carbon (C-C) bond is either a) ethylenically unsaturated when A and B may be alkyl, alkenyl or substituted hydrocarbyl groups or b) …
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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 May 17, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 17, 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.