Hearing protective earplug
CA 2064907 C · Owner: Cabot Safety Intermediate Corporation · Inventors: Gardner, Ross Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed herein a single-flange hearing protective earplug, of the push-in type. The earplug comprises a resilient polymeric foam body element (1) having a rounded nose end (4) and coextensive therewith, a rearwardly directed skirt (5) defining a flange (9) and an elongate axial stem (10) extending rearwardly from the body element (1). The earplug, in one or more of its embodiments is characterized by feature of, universal fit; comfort during insertion wearing and removal; effective, acoustic attenuation; easy insertion and removal and generally linear attenuation over the audible frequency spectrum. In a preferred embodiment of the invention the earplug features a duality of …
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 June 25, 1991 and granted October 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2013.
- 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.