Apparatus and method for blocking a contact lens button
CA 2267189 C · Owner: Bausch & Lomb, Incorporated · Inventors: Shannon, John H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A contact lens button and a block are, integrally formed together when the contact lens button is cast in a cup (10) having an aperture (20) formed in the center of the bottom wall (14) of the cup. The block has a first elongated end forming a spindle (23) and a second end which is of circular, generally planar configuration. The spindle end is inserted through the aperture in the bottom wall of the cup providing an interference fit with the circular end portion located inside the cup spaced parallel to and slightly upwardly from the bottom wall, and the first spindle end extends exteriorly of the cup. A quantity of liquid lens material is dispensed into the cup, completely surrounding the …
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 16, 1997 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2019.
- 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.