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United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A pre-formed insert with stable dimensions for mechanical insertion into a hollow member and that reduces the Nusselt number and convection across the hollow member. The insert may be formed of a low heat conducting material like PVC and have extensions and internal voids that impede convection in the hollow and conduction through the insert. The inserts may be used in stiles, rails, heads and sills of aluminum windows and doors. In one embodiment an insert is received in an open hollow and may cooperate with an insert in a frame hollow to decrease convection at the head end of a sliding window or door. An insert may be placed within the hollow of a window or door beside a roller assembly.
Lenox, Ronald M. (Cranberry Township, PA), Kumar, Sneh (Pittsburgh, PA)
Alcoa Inc. (Pittsburgh PA)
13/ 591,649
August 22, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0001] The development of a portion of the disclosed subject matter was supported in part by funds from the U.S. Department of Energy Award No. DE-EE0004012. The U.S. government may have certain rights in the claimed subject matter.