Double walled crash helmet with sealed breakthroughs and manufacturing technique
CA 2115695 C · Owner: Sperber, Gerhard · Inventors: Sperber, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bicycle helmet, comprising: an integrally molded helmet body having an inner shell and an outer shell the, inner and outer shells being concentrically spaced apart and integrally connected to each other by first shell connectors disposed proximate an edge portion of the helmet body. The inner and outer shells further being integrally connected by second shell connectors disposed proximate an intermediate portion of the shells spaced from the edge portion. The second shell connectors include an annular wall of a through opening contained in the helmet body between the shells the, annular wall including integrally molded converging wall portion and diverging wall portion in a direction from …
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 February 15, 1994 and granted September 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2016.
- 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.