Clara E. Nelson has been granted 5 US patents while listed as an inventor at Transitions Optical . The first was granted in 2007 and the most recent in July 2009. Clara E. Nelson ranks #907,971 of 4,157,543 US inventors in our database (top 21.8%). Patent records list Clara E. Nelson in Baldwin, PA, US.
Patents per Year Patents granted per year, 2007 to 2009 Bar chart with a peak of 2 patents in 2007. peak 2 2007: 2 patents 2007 2008: 1 patents 2008 2009: 2 patents 2009
Issued Patents All Time
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Showing 1–5 of 5 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
7557208 Naphthols useful for preparing indeno-fused photochromic naphthopyrans Robert W. Walters , Anil Kumar , Anu Chopra 2009-07-07
7517982 Naphthols useful for preparing indeno-fused photochromic naphthopyrans Robert W. Walters , Anil Kumar , Anu Chopra 2009-04-14
7320826 Photochromic articles with reduced temperature dependency and methods for preparation Anil Kumar , Barry Van Gemert , Forrest R. Blackburn 2008-01-22
$42,517,000
7262295 Indeno-fused photochromic naphthopyrans, naphthols and photochromic articles Robert W. Walters , Anil Kumar , Anu Chopra 2007-08-28
7166357 Photochromic articles that activate behind ultraviolet radiation blocking transparencies and methods for preparation Anil Kumar , Michael S. Misura , Robert W. Walters , Barry Van Gemert , Anu Chopra 2007-01-23