Perimeter seal for disposable respirators
CA 1296487 C · Owner: Minnesota Mining And Manufacturing Company · Inventors: Yard, Sabrina M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A partial perimeter face seal for molded disposable respirators and/or filtration masks attached to approximately one-third of the perimeter of the respirator in the nose and upper cheek areas is described. The face seal provides face fit or sealing performance comparable to that previously obtained only with respirators utilizing full perimeter seals.
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 March 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 3, 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.
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.