The total quantity of Tung Yu patent is twenty-seven. In 1990 Tung Yu applied for four patents; one patent in 1991; one patent in 1992; two patents in 1993; one patent in 1994; one patent in 1996; two patents in 1997; five patents in 2000; two patents in 2004; one patent in 2005; three patents in 2007 and four patents in 2008.
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