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Patent applications and USPTO patent grants for Heil; Oskar.The latest application filed is for "acoustic transducer and method of making same".
Patent | Date |
---|---|
Acoustic transducer and method of making same Grant 4,160,883 - Heil July 10, 1 | 1979-07-10 |
Electro-acoustic transducer Grant 4,107,479 - Heil August 15, 1 | 1978-08-15 |
Movable diaphragm connector method flexible hinge diaphragm surround and electro-acoustic transducer with folded diaphragm with intermediate flexible portions Grant 4,056,697 - Heil November 1, 1 | 1977-11-01 |
Electro-acoustic Transducer Grant 3,832,499 - Heil August 27, 1 | 1974-08-27 |
Acoustic Transducer With A Diaphragm Forming A Plurality Of Adjacent Narrow Air Spaces Open Only At One Side With The Open Sides Of Adjacent Air Spaces Alternatingly Facing In Opposite Directions Grant 3,636,278 - Heil January 18, 1 | 1972-01-18 |
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