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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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Dr Christian Heil landmark HF line array waveguide has been out of patent protection since 2012. Does anyone know if its being produced and sold by anybody?
https://www.google.com/patents/US5163167
thanks
Rafaro
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Topic - Does any one know if the out of patent Heil waveguide is being produced and sold? - Rafaro 07:51:49 06/01/17 (6)
- FYI - Inmate51 07:48:12 06/04/17 (0)
- RE: Does any one know if the out of patent Heil waveguide is being produced and sold? - claudej1@aol.com 07:39:11 06/03/17 (4)
- RE: Does any one know if the out of patent Heil waveguide is being produced and sold? - Rafaro 04:41:23 06/04/17 (0)
- RE: Does any one know if the out of patent Heil waveguide is being produced and sold? - amnesiac 01:26:40 06/04/17 (2)
- RE: Does any one know if the out of patent Heil waveguide is being produced and sold? - Crazy Dave 10:50:22 06/04/17 (1)
- RE: Does any one know if the out of patent Heil waveguide is being produced and sold? - Rafaro 10:36:30 06/12/17 (0)
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