Fire alarm without using electric power
CA 2087830 A1 · Owner: Lin, Ho Chien · Inventors: Lin, Ho Chien
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fire alarm without using electric power which, comprises a housing, an alarm assembly and a switch assembly; a driving spring in the alarm assembly is used for storing a driving energy. As soon as a nylon string in the alarm is burnt and broken, the driving spring will drive small hammers to hit a bell cup to send out a warning signal to warn people that a fire is taking place.
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 January 21, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2015.
- 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.