Improved spectacles
CA 2134769 A1 · Owner: M C Duthie (Investments) Limited · Inventors: Duthie, Josephine Ada; Duthie, Michael Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spectacle arrangement comprises a frame (1) having: legs (2); a top bar (3); a bottom bar (4) with a nose piece (5) and a lens , arrangement (6). An air supply (7) is provided via a flexible tube (8). Air outlets (9, 10 and 11) are provided. In operation the air supply (7) provides a plurality of air streams across a user's eyes, nose and mouth. This creates an area of slightly higher pressure filtered air in front of the user's face. As this is pollen free the cause of allergic reaction is removed thus providing relief to a hay fever sufferer.
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 May 1, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2014.
- 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.