beveridge patents

Harold Beveridge received three US patents on his work in speaker design. Although patents are not easy reading, these documents contain many interesting details and background reasons for design decisions.

• Patent No. 3,668,335 (not online) covers the design of the original (epoxy-based) transducer, the OTL amplifier, and the acoustic lens/cabinet combination.

• Patent No. 3,980,829 covers the design of the Model 2.

• Patent No. 4,270,023 covers the design of the Model 3.