Safety goggles lens retention
CA 2079247 C · Owner: Hewitt, Charles David · Inventors: Kelley, Andrew Thomas; Hewitt, Charles David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The eye protection lens of safety goggles provides increased impact protection without utilizing external fasteners or external sealing means. The mechanical attachment of the lens to the goggles rim is improved and stabilized against separation forces by the interlocking engagement of a wedge shaped retainer rib formed along the periphery of the safety lens. The lens support frame has a retainer rim which is intersected by an open slot, thereby defining an outside body portion and an inside body portion. An annular shoulder is formed on the inside body portion and partially closes the open slot. The retainer rib is received within the slot, with its apex being engaged against the inside …
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 September 28, 1992 and granted February 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2014.
- 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.