Nitrogen containing dispersants treated with mineral acids
CA 1303598 C · Owner: Vettel, Paula R. · Inventors: Vettel, Paula R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dispersant composition comprising the reaction product of an ashless dispersant selected from the group consisting of (i) Mannich dispersants, (ii) succinimide dispersants, (iii) succinate ester-amide dispersants and, (iv) polymeric viscosity index improvers having amine dispersant character, with an inorganic mineral acid selected from the group consisting of sulfuric, nitric and hydrochloric acids.
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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 June 16, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 2009.
- 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.