From Lawrence Menasco, Jr
Your Patents column describes the loudspeakers (WO 98/20706) being developed
by Thomson Brandt of Villingham, Germany, which behave like “acoustic windows”
(This Week, 8 August, p 11).
Barry Fox should also check out US patent 5 748 758 (filed 25 January 1996,
issued 5 May 1998), which describes an “aerogel” speaker that also achieves an
“acoustic window”-type effect using exactly the same process.
By the way, your magazine was the source of inspiration for the above
patent.
mh_ent@fishnet.net
