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Sound-absorbing surface covering material
US 2,556,884 A
Filed
: 01/14/1947
Issued
: 06/12/1951
Est. Priority Date
: 01/14/1947
Status: Expired due to Term
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Current Assignee
Theodor Muller
Original Assignee
Theodor Muller
Inventors
THEODOR MULLER
Application Number
US02/721,899
Time in Patent Office
1,610 Days
Field of Search
US Class Current
181/290
CPC Class Codes
E04B 1/8409
sheet-shaped
E04B 2001/8461
layered
E04B 2001/848
the cavities opening onto t...
E04B 2001/849
Groove or slot type openings
Y10T 428/24587
Oblique to longitudinal axi...
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