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US 8,757,318 B2Granted
Behind the detector sounder
OwnerDunstan Walter Runciman, David Denoon-Stevensinventors
Life of this patent
Estimating the term…
Abstract
A behind the detector sounder has a base plate and walls which define mechanical horns having throats which open into a space at the centre of the base plate. The mouths of the mechanical horns are at the outer periphery of the base plate and the walls bound sound paths which are longer than the straight line distance from the throat of each mechanical horn to the mouth of that mechanical horn.
Claims8
A behind the detector sounder which comprises
- a base plate and
- walls upstanding from the base plate, the walls defining a plurality of mechanical horns having throats which open into a space at the centre of the base plate and having mouths, the mouths of the mechanical horns being at the outer periphery of the base plate,
- said walls bounding sound paths which are longer than a straight line distance from the throat of each mechanical horn to the mouth of that mechanical horn.
Dependencies are inferred from the claim text.