Passive aircraft monitoring system
CA 2095367 C · Owner: He Holdings, Inc. · Inventors: Lynch, Thomas J.; Finkelstein, Marc; Geesaman, Martin J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A passive aircraft monitoring system (20) receives signals transmitted by an instrument landing system (14 16) and reflected from, aircraft (18). The Doppler shift in the reflected signals is used to calculate the ground speed and range of the aircraft. Using ILS 90 and 150 Hz signals reflected from the aircraft and comparing their magnitude the, altitude and lateral position of the aircraft can also be determined.
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 May 3, 1993 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 3, 2015.
- 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.