Additives for functional fluids
CA 1340293 C · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Friedrich, Hans-Helmut; Muller, Klaus; Wirth, Hermann O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula, (see fig. I) in which R1 and R2 are identical or different and are tert-C4 to tert-C7alkyl, C5 to C10cycloalkyl or pinane-10-yl and Q is -S-, -S-S-, -S-CH2-S- or -S-CH2-CH2-Sand compositions which comprise a functional fluid of the series of lubricants, hydraulic fluids or metalworking fluids and at least one compound of the formula I. The compositions may be employed especially in the lubrication system of diesel and spark-ignition engines and they reduce especially the wear on the cams of the camshafts and on the tappets of the valve train.
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 December 29, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 29, 2015.
- 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.