Auxiliary lenses for eyeglasses
CA 2276699 A1 · Owner: Ng, Dave · Inventors: Ng, Dave
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An auxiliary spectacle apparatus is provided wherein the primary frame has securing portions, located at positions proximal to its lateral ends and on the rear side of the primary frame, the, auxiliary frame has a bridge fastener for releasably engaging the bridge portion and lateral, fasteners for releasably engaging the securing portions and magnets at , positions between each lateral fastener and each securing portion.
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 June 30, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 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.