Sending system for detecting presence of an ink container and level of ink therein
CA 2185602 C · Owner: S-Printing Solution Co. Ltd. · Inventors: Hubble, Fred F. Iii; Stevens, Donald M.; Carlotta, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low ink sensing system is combined with an ink cartridge detection system to enable a more efficient ink jet printer. An ink container which supplies ink to an associated printhead is modified by the incorporation of two light directing elements in the preferred embodiment, a faceted prism and a roof mirror into a transparent wall of the container housing. The cartridge comprising the ink container and associated printhead is mounted on a scan carriage. Periodically the carriage is conveyed to a sensing station comprising a pair of light sources and a commonly used photosensor. A first light source is energized and a beam of light is directed to a location where the roof mirror would be …
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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 September 16, 1996 and granted November 28, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 2018.
- 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
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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.