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Optical fun device
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Patent number 5,288,260
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Issue date Feb 22, 1994
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Haw-Renn Chen
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A63 - SPORTS GAMES AMUSEMENTS
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Unified washing-drying machine
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Patent number 5,220,813
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Issue date Jun 22, 1993
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Haw-Renn Chen
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
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Tripod clip
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Patent number 4,918,789
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Issue date Apr 24, 1990
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Haw-Renn Chen
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B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
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Steady push pin
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Patent number 4,897,007
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Issue date Jan 30, 1990
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Haw-Renn Chen
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS