Single bi-aspherical lens
CA 1267014 C · Owner: Braat, Josephus J.M. · Inventors: Braat, Josephus J.M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Single bi-aspherical lens. A single element lens having two aspherical refractive surfaces is described, which lens comprises a lens substrate and two layers of a transparent plastics with an aspherical outer profile. m e lens substrate is a sphere and can be manufactured simply and cheaply.
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 March 27, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2007.
- 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.