Expired Canadian patentCanada
Bridge for attaching auxiliary lenses
CA 2426893 C · Owner: Ng, Dave · Inventors: Ng, Dave
Overview
Drawings and full text
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 auxiliary lenses have a mechanical bridge fastener for releasably engaging the bridge portion of the primary frames in a manner which provides security of attachment in all directions.
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 October 31, 2001 and granted February 26, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 31, 2001
GrantedFebruary 26, 2013
Term endedOctober 31, 2021
Patent numberCA 2426893 C
Classification (IPC)G02C9/00 +1 more
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.