Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Reexamination Certificate
2000-10-16
2002-08-06
Pihulic, Daniel T. (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
Reexamination Certificate
active
06430108
ABSTRACT:
The present invention relates to a pyroacoustic device constituting a jammer or decoy for protecting sub-marines or surface vessels.
Document U.S. Pat. No. 3,799,094 describes a pyrotechnic device for diverting an underwater system. The device comprises a vehicle which carries a plurality of charges that are distributed generally over a cylinder centered on a horizontal axis. The charges are urged radially outwards by respective springs and they are freed cyclically by a rod driven in rotation by a shaft. Each of the charges has a membrane so that as the charge sinks, the pressure on the payload increases, leading at a given depth, to heating capable of causing initiation. The document thus describes a device in accordance with the preamble of accompanying claim
1
.
An object of the present invention is to propose a novel device that is more effective than previously known devices against the homing systems of torpedoes.
In the context of the present invention, this object is achieved by a device comprising:
a structure suitable for forming a positioning device for controlled positioning under water; and
a case connected to the positioning device, which case contains:
a plurality of charges each suitable for generating an acoustic effect; and
control means suitable for initiating said plurality of charges in a controlled sequence characterized by the fact that the control means are adapted to define a time interval between initiation of two successive charges lying in the range 0.2 seconds (s) to 0.5 s.
REFERENCES:
patent: 3097600 (1963-07-01), Hopkins
patent: 3799094 (1974-03-01), Hill
patent: 3808940 (1974-05-01), Schilreff et al.
patent: 4975890 (1990-12-01), Wolf et al.
patent: 5117731 (1992-06-01), Mendenhall
patent: 5341343 (1994-08-01), Aske
patent: 5341718 (1994-08-01), Woodall, Jr. et al.
Mourry Philippe
Pignol Marc
Blakely & Sokoloff, Taylor & Zafman
Etienne Lacroix - Tous Artifices S.A.
Pihulic Daniel T.
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