Temperature insensitive web moisture sensor and method
CA 2098986 C · Owner: Anderson, Leonard M. · Inventors: Anderson, Leonard M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An infrared web moisture sensor (10) which is substantially temperature and basis weight insensitive comprises a source (16) of infrared radiation for directing an infrared beam (24) through the web (12) and an infrared detecting unit (18) on the other side of the web which measures the transmission of the infrared beam through the web at three separate wavelength regions. The transmission in the first wavelength region is primarily sensitive to the moisture content of the web. The transmission in the second wavelength region is less sensitive to the moisture content. The transmission in the third wavelength region provides an indication of the web temperature. Temperature insensitivity is …
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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
- Filed January 3, 1992 and granted April 7, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2014.
- 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.