Patent Yard Sign in
Expired Canadian patentCanada

Low vision eye glasses

CA 1307412 C · Owner: Parker, William Seal · Inventors: Parker, William Seal

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Abstract From the Canadian patent

Eye glasses are disclosed for improving the vision of people with macular degeneration optic, nerve damage or similar low vision problems. The glasses comprise two lens assemblies, each having a magnifying lens with two convex surfaces and a reducing lens with two concave surfaces. The reducing lens incorporates prism rings which focus an image or light onto an undamaged portion of the macular. A frame is employed for supporting each assembly at a predetermined distance from an eye of a user and for supporting the lenses assembly in a predetermined orientation with respect to each other with the lenses defining a fixed space therebetween. Also disclosed are the lenses themselves and 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

  • Granted September 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 9, 1988
GrantedSeptember 15, 1992
Term endedSeptember 15, 2009
Patent numberCA 1307412 C
Classification (IPC)G02C7/06 +1 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedSep 9, 1988Patent grantedSep 15, 1992Term endedSep 15, 2009

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.