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Patent applications and USPTO patent grants for Sippola; Duane Frederick.The latest application filed is for "efficiently installable and durable embedment tile for producing tactilely-detectable surfaces".
Patent | Date |
---|---|
Efficiently installable and durable embedment tile for producing tactilely-detectable surfaces Grant 7,845,122 - Sippola December 7, 2 | 2010-12-07 |
Device for producing tactile-detectable warning surfaces and method for employing same Grant 7,001,103 - Sippola February 21, 2 | 2006-02-21 |
Efficiently installable and durable embedment tile for producing tactilely-detectable surfaces App 20050066623 - Sippola, Duane Frederick | 2005-03-31 |
Device for producing tactile-detectable warning surfaces and method for employing same App 20050031415 - Sippola, Duane Frederick | 2005-02-10 |
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