Selenium is often used as an additive to glass: Selenium-Containing Glass (1947).
Some selenium compounds decolourise glass (Decoloring Method For Soda Glass With Selenium In Continuous Tape Tank Furnace (1982)), while others give a deep red colour (Selenium Ruby Glass (1947)).
Selenium can also be used with other components to reduce the transmission of sunlight in vehicle windscreen glass, giving it a bronze tint: Bronze-Colored Glass Composition (1995).
Selenium has been known for decades for its role in photovoltaism (A Method Of Making A Selenium Photo Element (1961)), and photoconductivity (Electrophotochemical Preparation Of Selenium Photoconductive Members (1978)). It is therefore useful in photocells, solar cells and photocopiers. It can also convert AC electricity to DC electricity, so is extensively used in rectifiers (Method Of Making Selenium Rectifiers (1954)).
Selenium sulfide is used in some anti-dandruff shampoos: Shampoo Compositions (1989).
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All patent information has been obtained from Espacenet (European Patent Office).