Acoustics – Sound-modifying means – Sound absorbing panels
Reexamination Certificate
2011-07-05
2011-07-05
Phillips, Forrest M (Department: 2832)
Acoustics
Sound-modifying means
Sound absorbing panels
C181S290000, C181S284000, C244S00100R, C415S119000
Reexamination Certificate
active
07971684
ABSTRACT:
A panel for acoustic treatment connected to a surface of an aircraft, includes—from the outside to the inside—an acoustically resistive porous layer, at least one alveolar structure, and a reflective or impermeable layer, whereby the acoustically resistive porous layer includes—at the outside surface that can be in contact with the aerodynamic flows—one sheet or piece of sheet metal including open zones (14) that allow sound waves to pass and filled zones (16) that do not allow sound waves to pass, characterized in that the sheet or piece of sheet metal of the acoustically resistive layer includes sets of microperforations (18), whereby each set of microperforations forms an open zone (14), the sets of microperforations being separated from one another by at least one series of bands separated by filled zones (16).
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International Search Report dated Sep. 29, 2008, from corresponding PCT application.
Duprieu Bernard
Frustie Valerie
Gantie Fabrice
Gilles Thomas
Lalane Jacques
Airbus Operations (SAS)
Phillips Forrest M
Young & Thompson
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