Eyeglasses with exchangeable lenses
CA 1287761 C · Owner: Weber, Karl · Inventors: Weber, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Eyeglasses which enable the lenses to be replaced quickly are provided. The glasses have a frame consisting of two loops each having several spaced clips within which the lenses can be retained. The frame loops are joined together by a bridge. A spring loaded slide is received in the bridge the slide having, hooks which attach over the upper edges of the lenses. The slide can be pushed upwards against the force of the spring to free the hooks from the lenses, allowing the lenses to be removed.
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
- Granted August 20, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2008.
- 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.