A welding operation liquid crystal protection mask
CA 2425249 A1 · Owner: 3M Innovative Properties Company · Inventors: Suyama, Shunsuke; Miyashita, Kiyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A welding-operation, liquid crystal, protection mask for protecting the eyes of a human operator from an arc light generated during a welding operation comprises a liquid crystal protection mask main body (1) adapted to be attached to the face of a human operator; a detecting means (2) disposed in the vicinity of the liquid crystal protection mask main body and capable of detecting an incident arc light generated during the welding operation and thus producing a detection result; a liquid crystal light blocking section (3) that is disposed in a position corresponding to the eyes of a human operator wearing the protection mask with the human face being covered by the protection mask …
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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 November 8, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 8, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2023.
- 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.