Expired Canadian patentCanada
Chromatographic optical detector
CA 1288611 C · Owner: Tullsen, Thomas R. · Inventors: Tullsen, Thomas R.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Invention An optical detector is provided. The optical detector provides automatic zeroing of a logarithmic ration function in applications such as absorption meters fluorometers and other chromatographic techniques.
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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 September 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 10, 2008.
- 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 12, 1987
GrantedSeptember 10, 1991
Term endedSeptember 10, 2008
Patent numberCA 1288611 C
Classification (IPC)G01N30/62 +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.