Ear protection device for hard hat
CA 1080632 A · Owner: Arcair Company · Inventors: Henderson, Harold R.; Rieppel, Perry J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A welder's helmet having means to reduce the level of noise reaching a welder's ears when the helmet is positioned for welding. The helmet is characterized by the fact that the sound reducing means while fixed to the helmet does not contact o? rest upon the head, ears or face of the welder thus not interfering with normal atmosphere circulation between the welder's head and helmet.
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 July 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 1, 1997.
- 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.