Reaction products of polyisobutylenes and nitrogen oxides or mixtures of nitrogen oxides and oxygen and their use as fuel and lubricant additives
CA 2195575 C · Owner: Hickmann, Eckhard · Inventors: Rath, Hans Peter; Ebel, Klaus; Schwahn, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns reaction products of polyisobutylenes having an average polymerisation degree P of 10 to 100 and a proportion E of 60 to 90 % of double bonds , which can be reacted with maleic acid anhydride E corresponding to 100 % of , the calculated theoretical value if each polyisobutylene molecule has a reactive double bond of this type, with nitrogen oxides or mixtures of nitrogen oxides and oxygen. These reaction products are , suitable as fuel additives in particular for spark-ignition engines and a , lubricant additives.
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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
- Filed July 18, 1995 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 18, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 2017.
- 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.