Expired Canadian patentCanada
Quartz fibre electroscopes
CA 553370 A · Owner: Minister Of Supply In His Majesty'S Government Of The United Kingdom Of Great Britain And Northern Ireland · Inventors: Ronald P. Henderson
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 February 18, 1958. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 18, 1975.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedFebruary 18, 1958
Term endedFebruary 18, 1975
Patent numberCA 553370 A
Classification (IPC)H01J47/04
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.