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US 4,743,740 AGranted
Buried element deicer
AssigneeRohr Industries, Inc.
InventorJames M. Adee
Life of this patent
Estimating the term…
Abstract
A perforated flat ribbon heating element embedded or sandwiched between the porous material and perforated sheet of honeycomb acoustic panel material used for sound suppression and deicing on ice buildup areas of an aircraft engine.
Claims8
Acoustic attenuation and ice-protection material used for aircraft structures which are exposed to the sound of jet engines, other noise producing mechanisms and ice buildup, said material having a predetermined flow-through resistance, comprising:
- (a) a honeycomb core having a plurality of endwise directed cells;
- (b) an unperforated facing sheet secured to the edges of said cells along one side of said honeycomb core;
- (c) a perforated facing sheet secured to the edges of said cells along the other side of said honeycomb to form a Helmholz resonator structure with said unperforated facing sheet and said honeycomb core;
- (d) a perforated heating element secured to said perforated facing sheet, perforations in said facing sheet being in alignment with perforations in said heating element;
- and
- a thin sheet of porous material secured to said perforated heating element on the side thereof remote from said perforated facing sheet.
3 more elements
Dependencies are inferred from the claim text.