Canadian application, no grantCanada
Low viscocity, chloride-free, low overbased alkyl-aryl-sulfonate, its application as an additive for lubricating oil, and methods of preparation
CA 2273191 A1 · Owner: Chevron Chemical Company · Inventors: Mcdonald, John
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low overbased alkyl phenyl sulfonate prepared by the neutralization of sulfonic, acid with a sulfurized high TBN calcium alkylphenate in the absence of chloride, and in the absence of additional carboxylic acid.
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 May 28, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 28, 1999
GrantedNo grant recorded
Term endedMay 28, 2019
Patent numberCA 2273191 A1
Classification (IPC)C07C309/31 +2 more
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.