Face shield for helmet
CA 2213803 C · Owner: Korea Ogk Co. Ltd. · Inventors: Park, Soo An
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A face shield for a helmet. The face shield having a weather lens and a face lens spaced from the weather lens so as to form an air gap, is characterized in that an electroconductive film is attached to the air gap of the weather lens, in that upper and lower electrodes are printed on upper and lower sides of the electroconductive film receptively, and in that the weather lens is made from a material such as a polycarbonate, butyrate or an acrylic, and, the face lens from an anti-fog sheet.
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 August 25, 1997 and granted October 10, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 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.