Spectacles and assembly for releasable interfitting of an auxiliary glasses frame
CA 2258142 C · Owner: Wong, Edmund · Inventors: Wong, Edmund
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An assembly enabling detachable fitting of a pair of auxiliary lenses to a pair of primary spectacles; the assembly including a pair of projections on a, primary spectacle frame each having a recess or opening which each receive a corresponding projection on an auxiliary frame which holds the pair of auxiliary, lenses. The arrangement is such that each projection on the auxiliary frame positively engages an opening on a corresponding projection on the primary spectacle frame.
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 January 6, 1999 and granted March 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 6, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 6, 2021.
- 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.