Toilet cleansing block
CA 2254789 C · Owner: S.C. Johnson & Son, Inc. · Inventors: Wortley, Russel B.; Klinkhammer, Michael E.; Veltman, Jerome J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a toilet cleansing block containing anionic surfactant such as a sulfonate, linear primary alcohol such as Neodol RTM. 23 and binder such as hydroxy ehtyl cellulose. The block erodes very slowly yet at essentially identical rates in hard or soft water. The block is for use with a dispenser for immersion in toilet tanks or under the rim of a toilet basin.
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
- Filed May 14, 1997 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2019.
- 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.