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USPTO Patent Rankings Data through Dec 31, 2025
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Stephen C. Darfler — 4 Patents

HEHexcel: 4 patents #28 of 219Top 15%
Castro Valley, CA: #235 of 760 inventorsTop 35%
California: #126,026 of 386,348 inventorsTop 35%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
Stephen C. Darfler has been granted 4 US patents while listed as an inventor at Hexcel. The first was granted in 1995 and the most recent in June 1996. Stephen C. Darfler ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list Stephen C. Darfler in Castro Valley, CA, US.

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
5527584 High thermal conductivity triaxial non-metallic honeycomb Carla Ahlstrom, Mark S. Caldwell 1996-06-18 $5,264,000
5498462 High thermal conductivity non-metallic honeycomb 1996-03-12 $1,140,000
5470633 High thermal conductivity non-metallic honeycomb with optimum pitch fiber angle 1995-11-28 $2,767,000
5466507 High thermal conductivity non-metallic honeycomb with laminated cell walls 1995-11-14 $2,766,000