Patent Yard Sign in
Expired Canadian patentCanada

One-solution type formulation for disinfecting, neutralizing and cleaning contact lenses and method for their disinfecting, neutralizing and cleaning

CA 2257263 C · Owner: Ohnuma, Takeshi · Inventors: Fujii, Takashi; Nakamura, Shigeru; Tanouchi, Hiroshi

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Abstract From the Canadian patent

A preparation for simultaneously conducting disinfection neutralization and , cleaning of soft contact lenses and a method for using easily, efficiently and safely the preparation. The preparation comprises a combination of a first preparation containing an iodine disinfectant and a protease with a second preparation containing a reducing agent and a foaming agent and having a coating for delayed release, and a nonionic surfactant is contained in at least one of the first and second preparations. Soiled soft contact lenses are kept in an aqueous solution yellowed or browned with iodine molecules and, after the aqueous solution has become substantially colorless the lenses are , …

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 April 3, 1997 and granted November 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2017.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 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.
FiledApril 3, 1997
GrantedNovember 19, 2002
Term endedApril 3, 2017
Patent numberCA 2257263 C
Classification (IPC)A61L2/18 +2 more

Timeline

Timeline From CIPO dates

1998200020022004200620082010201220142016Application filedApril 3, 1997Patent grantedNov 19, 2002Term endedApril 3, 2017

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.