Heil's "Air Motion Transformer" US Patents
- US#3,636,278 issued Jan 18, 1972.
- (Describes the Heil AMT variations, some of which resemble the ELAC JET transducer)
- US#3,832,499 issued Aug. 2, 1974.
- (Describes the Heil AMT embodiment used in the ESS AMT series)
- US#4,056,697 issued Nov 1, 1977.
- Movable diaphragm connector method flexible hinge diaphragm surround and...
- US#4,039,044 issued Aug 2, 1977.
- (Low-frequency AMT. The patent also describes the principle used by Tymphany for their LAT transducer including the embodiment type)
- US#4,107,479 Aug 15, 1978.
- (Further refinements of the low-frequency AMT)
- US#4,160,883 Jul 10, 1979.
- Acoustic transducer and method of making same
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