Method and a system for monitoring a sea area
CA 1235474 A · Owner: N.V.Philips'Gloeilampenfabrieken · Inventors: Gustafson, Bengt G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and a system for monitoring a sea area. The invention relates to a method and a system for monitoring a water area with regards to presence and localization of unknown objects, which transmit sound in, particular submarines. According to the invention three or more listening devices (A1, A2, A3) are thrown out in an area, where indication about an unknown object has been obtained. The listening devices are provided with hydrophones and radio transmitters for transmission of received sound by modulation on a carrier. The devices cooperate with stationary radio stations (M1 M2, M3), where the sound waves are demodulated. Time correlation between the sound waves from an object …
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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
- Granted April 19, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 19, 2005.
- 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.