JH

John David Hepworth

PL Pilkington Group Limited: 1 patents #1 of 15Top 7%
📍 Preston, GB: #2 of 13 inventorsTop 20%
Overall (1997): #128,770 of 185,788Top 70%
1
Patents 1997

Issued Patents 1997

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5623005 Photochromic naphthopyran compounds Martin Rickwood, Katharine E. Smith, Christopher David Gabbutt 1997-04-22