John Sloan Stewart

Title: John Sloan Stewart and Loudspeaker Innovation.

Introduction

John Sloan Stewart is an inventor based in Bloomington, Indiana, whose patent work focuses on loudspeaker components and acoustic performance. He is associated with Harman International Industries, Inc. His portfolio includes 4 patents.

Latest Patents

Stewart’s recent patent work includes innovations in loudspeaker materials and transducer design.

“Loudspeaker cone body” describes a paper loudspeaker cone incorporating chemically bound nanomaterials, such as carbon nanotubes. The nanotubes can be linked through functionalizing agents to papermaking additives or cellulose-containing materials. This approach can alter acoustic characteristics, including the cone’s stiffness-to-weight ratio and damping.

“Concentric radial ring motor” describes a voice-coil transducer with two radially concentric magnets and a voice coil positioned in the gap between them. A diaphragm coupled to the voice coil produces sound, while a chassis supports the transducer components.

Career Highlights

Stewart’s listed inventions address practical aspects of loudspeaker engineering, from the composition of the cone to the arrangement of magnets and voice coils. His work connects material science and transducer architecture with the goal of shaping loudspeaker performance.

Collaborations

Stewart’s listed coworkers include Ryszard A. Pilatowski and John F. Steere. His association with Harman International Industries, Inc. places his work within a company known for audio products and technologies.

Conclusion

John Sloan Stewart’s patents reflect a focused contribution to loudspeaker innovation, spanning nanomaterial-enhanced cone bodies and concentric-magnet transducer designs.