Ppg Industries Ohio, Inc.

James V Hartmann

Larry J Shelestak

Mehran Arbab

Caroline S Harris

George B Goodwin

Calvin B Blevins

Spencer B Harrison

A low infrared absorbing lithium glass includes FeO in the range of 0.0005-0.015 wt. %, more preferably 0.001-0.010 wt. %, and a redox ratio in the range of 0.005-0.15, more preferably in the range of 0.005-0.10. The glass can be chemically tempered and used to provide a ballistic viewing cover for night vision goggles or scope. A method is provided to change a glass making process from making a high infrared absorbing lithium glass having FeO in the range of 0.02 to 0.04 wt. % and a redox ratio in the range of 0.2 to 0.4 to the low infrared absorbing lithium glass by adding additional oxidizers to the batch materials. A second method is provided to change a glass making process from making a low infrared absorbing lithium glass to the high infrared absorbing lithium glass by adding additional reducers to the batch material. In one embodiment of the invention the oxidizer is CeO. An embodiment of the invention covers a glass made according to the method.

Lithium containing glass with high and low oxidized iron content, and products using same

An aircraft transparency assembly includes an aircraft transparency having at least one ply having an outer surface and an extended portion. The assembly also includes a pressure seal configured to engage the extended portion of the ply, wherein the pressure seal includes a pressure seal body and at least one integrated compression stop. The transparency assembly can also include an anti-static drain assembly including at least one flexible conductive element having a first end in electrical contact with the outer surface of the ply, for example with an optional conductive coating on the outer surface of the ply, and a second end configured to contact the pressure seal.

Aircraft transparency with pressure seal and/or anti-static drain

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Huntsville, AL, United States of America

James V Hartmann