Remote instrument testing system
CA 2032384 C · Owner: Maltby, Frederick L. · Inventors: Maltby, Frederick L.; Kramer, L. Jonathan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for testing an instrument system includes a testing signal generator coupled to the instrument output transmission line at a location remote from the instrument. Testing signals are received by a testing signal receiver coupled to the transmission line near the instrument, whereupon an instrument input signal is supplied which simulates the signal supplied by a sensor to the instrument under certain conditions which, will cause a corresponding instrument output signal at the remote location if the entire system is working properly. The invention is useful for level measuring instrument systems used to prevent overfilling a vessel with material, and enables verification of proper …
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 December 17, 1990 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2012.
- 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.