Lubricant additive formed by neutralisation of a sulphurised alkyl phenol and a mannich base
CA 1069501 A · Owner: Orobis Limited · Inventors: Crawford, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lubricant additive comprising the reaction product obtained by neutralising a sulphurised alkyl phenol containing at least 4 wt % sulphur and a Mannich base containing at least 2 wt % nitrogen with an alkaline earth metal oxide or hydroxide, the Mannich base having a molecular wt of at least 600 and being prepared from an alkylene or polyalkylene polyamine, alkyl phenol and formaldehyde, the neutralisation being carried out at elevated temperature and in the presence of a hydroxylic solvent.
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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 January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.