Appeal No. 1996-1891
Application 08/058,478
damping material also acts to reduce the speed of
sound, thereby reducing the necessary line length
and enclosure dimension. [Emphasis added.] [Col. 1,
lines 39-62.]
Taddeo's invention is the use of goat's hair (mohair) instead
of wool as the sound absorbing material (col. 2, lines 31-36).
"Typically the goat's hair is stuffed in rather large
quantities, as compared to the wool heretofore employed, in a
portion of the speaker labyrinth to interpose the goat's hair
stuffing between the speaker or driver and the outlet end of
the labyrinth" (col. 2, lines 36-40). Taddeo's Figure 2 shows
an embodiment in which the mohair is located at one of the two
U-shaped bends in the labyrinth passage about midway between
transducer 12 and
opening 13. This figure is described as follows at column 4,
lines 4-10: "In order to dampen undesirable sound waves in
housing 10, the labyrinth, which is formed in the housing by
the partitions 15, 18, 19 between the driver 12 and the port
13, is partially stuffed or filled as at 20 in FIG. 2 with
mohair fibers up to the level L. Thus, sound waves emanating
from the speaker 12 must pass through the mohair filling 20
before reaching port 13."
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