Disposable/reusable sun filter
CA 2184573 C · Owner: Elterman, Warren B. · Inventors: Elterman, Warren B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light shield is provided which includes a relatively thin but preferably rigid body of light permeable material. An arrangement is interposed between the body of light permeable material and one side of the lens to mount the shield directly on the lens in light intercepting relationship relative to the eye of a user of the lens. The shield which is preferably mounted in generally cantilever manner on the lens is removable and can be reinstalled repeatedly. Preferably an adhesive is used which provides for a minimum of residue on the lens and the shield is preferably affixed to the lens in such a way that there is a minimum of optical interference.
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 March 7, 1995 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2017.
- 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.