Abstract
Stanley Ehrlich was an innovative sonar transducer designer and inventor who made many important contributions to the field of acoustic transduction at Raytheon Submarine Signal Division in Portsmouth, Rhode Island. With the advent of searchable digital patent archives at the USPTO and google/patents, it is now relatively easy to review Stan's patents and gain a glimpse at his innovation and creativity. This presentation reviews some these patents including: Sonar Transducer, that describes a multimode transducer producing simultaneously two dipole patterns with mutually perpendicular acoustic axes and an omnidirectional pattern; a Spherical [Multimode] Acoustic Transducer (#3732535 filed 1969) that enables the radial and circumferential vibrating modes of the acoustically excited sphere to be processed to determine bearing. The presentation also draws connections of these and other Ehrlich inventions to more recent ongoing works in multimode transducers.
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