Expired Canadian patentCanada
Arrangement for inhibiting the effect of extraneous electric fields on an improved ionization smoke detector
CA 1104271 A · Owner: General Electric Company · Inventors: Byrne, Michael
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ionization type of smoke detector is described having a means for reducing the effect of extraneous electrical fields which penetrate an ionization chamber of the detector.
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 June 30, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 30, 1978
GrantedJune 30, 1981
Term endedJune 30, 1998
Patent numberCA 1104271 A
Classification (IPC)G01T1/18 +1 more
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.