Two-beam colorimeter
CA 1061593 A · Owner: Siemens Aktiengesellschaft · Inventors: Helder, Johan; De Steur, Hubert; Pernegger, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Two-beam colorimeters, used for the colorimetric determination of a liquid component, have the disadvantages that the reference filter which is used is not, by itself, adequate to produce precise colorimetric measurement. In addition when the colorimeter is in continuous operation the intensity, of the light source diminishes. This invention overcomes these difficulties through the use of a movable adjusting filter and through the use of a, resistor connected in series with the light source. The invention provides a two-beam colorimeter comprising an incandescent lamp a resistor connected, electrically in series with the incandescent lamp a condenser, an interfer-, ence filter and a …
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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 4, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 4, 1996.
- 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.