Piezoelectric hydrophone
CA 1299731 C · Owner: Brudal, Hans N. · Inventors: Tetlie, Per J.; Brudal, Hans N.; Meisingset, Alf E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A piezoelectric hydrophone is designed with overload protectors which protects the hydrophone against internal and external overpressures. The hydrophone assembly proper and a first overload protector are made in one piece while other over-, load protectors are mounted outside the hydrophone assembly above the pressure sensitive diaphragms. The separate metallic parts of the hydrophone are joined by means of laser welding which may be performed in a pressure chamber. Likewise the final sealing of the hydrophone assembly may take place in a pressure chamber under a pressure corresponding to the water depth at which the hydrophone is operated.
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
- Granted April 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 28, 2009.
- 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.