Ph-controlled protein removing cleaner
CA 2032236 C · Owner: Tsao, Fu-Pao · Inventors: Tsao, Fu-Pao; Dandridge, Rosalind
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pH controlled protein removal system and a method of using it in the substantial, absence of a protein digesting enzyme and preferably, in the substantial , absence of a surfactant is disclosed. The system is a pH-controlled protein-cleaning composition for, e.g. contact lenses comprising (a) water; (b) a tonicity builder sufficient to render said, composition ophthalmically acceptable; and (c) a pH regulator sufficient to provide and, maintain the pH of the composition at a pH of about 7.5 to about 11.5; in the substantial, absence of a protein-digesting enzyme. The inventive method is for removing proteinaceous deposits from a polymeric substrate e.g, a contact lens, in the , …
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 December 13, 1990 and granted June 12, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2012.
- 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.