Acidic liquid cleaning composition
CA 1329751 C · Owner: Unilever Plc · Inventors: Stirling, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An acidic, aqueous liquid detergent composition especially suitable for toilet bowl cleaning is, provided with a colour-change ingredient to enable the user to monitor the concentration of the composition upon dilution with water when using the product. By including a detergent-active compound which exists in cationic form in the acid composition and a dye which undergoes a pH-dependent colour change in the acid pH range, the required colour change indication is obtained.
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 May 24, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 24, 2011.
- 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.