Inventor · Maidenhead, GB

John Clifford Head

40Patents
12h-index
24Co-inventors
81Inventor score

Filing activity: May 15, 1987 → Mar 31, 2009

Most-cited inventions

PatentTitleAreaCited byStatus
US5849770A Tri-substituted phenyl derivatives useful as PDE IV inhibitors Human Necessities 93 Expired
US5622977A Tri-substituted (aryl or heteroaryl) derivatives and pharmaceutical compositions containing the same Chemistry; Metallurgy 62 Expired
US5608070A Enantioselective process for the preparation of chiral triaryl derivatives and chiral intermediates for use therein Chemistry; Metallurgy 48 Expired
US5693659A Substituted oxime derivatives and processes for their preparation Chemistry; Metallurgy 42 Expired
US6369229B1 Pyridylalanine derivatives Chemistry; Metallurgy 39 Expired
US6518283B1 Squaric acid derivatives Chemistry; Metallurgy 39 Expired
US5780477A Trisubstituted phenyl derivatives and processes for their preparation Chemistry; Metallurgy 34 Expired
US4889553A Herbicides Chemistry; Metallurgy 32 Expired
US6093696A Tyrosine derivatives Human Necessities 25 Expired
US4959094A 1-chloropyrimidinyl-1H-1,2,4-triazole-3-sulphonamides as herbicides Chemistry; Metallurgy 23 Expired
US6110945A Aromatic amine derivatives Chemistry; Metallurgy 23 Expired
US6329372A Phenylalanine derivatives Chemistry; Metallurgy 13 Expired
US6197794A Phenylalanine derivatives Human Necessities 12 Expired
US6297264A Trisubstituted phenyl derivatives and process for their preparation Chemistry; Metallurgy 10 Expired
US6362204B1 Phenylalanine derivatives Human Necessities 8 Expired
US6348463B1 Phenylalanine derivatives Chemistry; Metallurgy 8 Expired
US6878718B2 Phenylalanine enamide derivatives Chemistry; Metallurgy 7 Expired
US6953798B1 β-alanine derivates Chemistry; Metallurgy 6 Expired
US6610700B2 Enamine derivatives Chemistry; Metallurgy 6 Expired
US6677339B2 Phenylalanine derivatives Chemistry; Metallurgy 6 Expired
US6911451B1 Phenylalanine derivatives Chemistry; Metallurgy 6 Expired
US6555562B1 Phenylalanine derivatives Chemistry; Metallurgy 6 Expired
US7122556B2 Phenylalanine enamide derivatives Chemistry; Metallurgy 5 Expired
US6780874B2 Enamine derivatives Chemistry; Metallurgy 5 Expired
US6329362A Cinnamic acid derivatives Human Necessities 5 Expired

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.