Process for reducing drag in flowing aqueous media
CA 1208421 A · Owner: Hoechst Aktiengesellschaft · Inventors: Interthal, Werner; Ohlendorf, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for reducing the drag of aqueous media in turbulent or pulsating flow, by adding to the aqueous medium a compound of the formula, R1-K?A? in which K denotes a group of the formula or, , R2 denotes C1-C3-alkyl, preferably methyl, A denotes an anion of the following formulae Hal denotes fluorine, chlorine, bromine or iodine R3, denotes C7-C10-alkyl or C7-C10-alkenyl and if A = thiocyanate, R1 denotes C16-C26-alkyl or C16-C26alkenyl, if A = p-toluenesulfonate, R1 denotes C12-C26alkyl or C12-C26-alkenyl, and if A has one of the remanning meanings R1 denotes C16-alkyl or C16-alkenyl.
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
- Granted July 29, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 2003.
- 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.