Disposable ear plug
CA 1187815 A · Owner: Leight, Howard S. · Inventors: Leight, Howard S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ear plug is described, which includes a shell formed of closed cell foam material, with the shell surface having a multiplicity of small bumps that also form the walls of cells which lie at the surface of the shell whereby to avoid wrinkling when the shell is squeezed into the ear canal. A stem of resilient material lies freely moveable in the shell, and is short so it extends substantially no further than the open end of the shell.
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 May 28, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2002.
- 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.