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| Number | Title | Issue Date |
| 6952874 | Two-stage phasing plug system in a compression driver This invention provides a two-stage phasing plug located within a compression driver. The two-stage phasing plug housed within the compression driver may be coupled to a horn. The two-stage phasing plug includes first and second phasing plugs. The advantages of havi... | 10/11/2005 |
| 4484383 | Method of manufacturing a speaker diaphragm A multi-layer block to be developed into a disk having a honeycomb construction is initially developed into a columnar block, and then the bottom of the columnar block is radially developed for obtaining a core of a speaker diaphragm. A suitable circular ... | 11/27/1984 |
| 4042438 | Method of assembling a diaphragm assembly for an electro-acoustic transducer In assembling at least one metal frame in abutting supporting relation to a diaphragm to form a diaphragm assembly for an electro-acoustic transducer, for example, as in a microphone or headphone, the diaphragm, which may be an electret, is formed at leas... | 08/16/1977 |
