Method and apparatus for candling envelopes
CA 2034864 A1 · Owner: Opex Corporation · Inventors: Lile, William R.; Lange, Russell M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A candling system for a mail extraction device incorporates a light source in the form of a light emitting diode and a cooperating photo-transistor detector which operate in the infrared range, to increase the system's immunity to environmental variations, and a linearization circuit for increasing the differentials in voltage which are developed between adjacent density levels (relative to the number of sheets involved), to permit the system to better monitor (distinguish between) envelopes containing an increased number of documents with improved accuracy and efficiency.
Read 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
- Filed January 24, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 24, 2013.
- 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.