Expired Canadian patentCanada
Method of and apparatus for monitoring gaseous pollutants
CA 1181612 A · Owner: Imperial Chemical Industries Plc · Inventors: Cramp, John H. W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Laser scanning apparatus for monitoring gaseous pollutants uses two intersecting scanning beams so that the point of intersection (which is monitored by both scanning beams) can be identified by triangulation.
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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 January 29, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 4, 1982
GrantedJanuary 29, 1985
Term endedJanuary 29, 2002
Patent numberCA 1181612 A
Classification (IPC)G01N21/00 +2 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.