Dates for inventions are often controversial. Inventions are often invented by several inventors around the same time, or may be invented in an impractical form many years before another inventor improves the invention into a practical form. Where there is ambiguity, the date of the first working version of the invention is used here. 

1990: World Wide Web: Tim Berners-Lee

1993: Global Positioning System: United States Department of Defense

1993: Blue LED: Shuji Nakamura

1997: Non-mechanical Digital Audio Player: SaeHan Information Systems

1997: DVD

1997: Wi-Fi: Alex Hills

1998: Viagra: Nicholas Terret, Peter Dunn (scientist) and Albert Wood  

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