Ulrich Heywang
21Patents
7h-index
28Co-inventors
65Inventor score
Filing activity: Sep 4, 1991 → Nov 21, 2001
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5730960A | Benzylidenenorcamphor derivatives | Chemistry; Metallurgy | 75 | Expired |
| US5705169A | Ketotricyclo .5.2.1.0! decane derivatives | Human Necessities | 74 | Expired |
| US5520906A | Triazine derivatives with UV filter properties | Chemistry; Metallurgy | 10 | Expired |
| US5817862A | Process for the preparation of cinnamic acid derivatives | Chemistry; Metallurgy | 9 | Expired |
| US5718906A | Light-stable cosmetic composition | Human Necessities | 9 | Expired |
| US6440401B1 | 2-phenyl-benzimidazolesulfonic acids as UV-B filters | Human Necessities | 8 | Expired |
| US5144081A | Dialkoxybenzylidene-camphor derivatives | Chemistry; Metallurgy | 8 | Expired |
| US5501850A | Use of benzimidazole derivatives as light protection filters | Chemistry; Metallurgy | 7 | Expired |
| US5473079A | Process for preparing 2-arylbenzimidazole-5-sulfonic acids | Human Necessities | 5 | Expired |
| US5399563A | Benzylidenequinuclidinones | Chemistry; Metallurgy | 3 | Expired |
| US6593476B2 | Process for the preparation of UV filter substances | Chemistry; Metallurgy | 3 | Expired |
| US5677314A | Bis(methylidene)phenylene derivatives | Chemistry; Metallurgy | 3 | Expired |
| US5639883A | Process for preparing substituted 4-methylidenecinnamic acid derivatives | Performing Operations; Transporting | 2 | Expired |
| US5600007A | Use of .alpha.-hydroxyketoalkyl derivatives as light protection filters | Human Necessities | 2 | Expired |
| US5180837A | Pilosinine derivatives | Human Necessities | 1 | Expired |
| US5968482A | .alpha.-hydroxyketoalkyl derivatives as light protection filters | Human Necessities | 0 | Expired |
| US6277357A | Ketotricyclo[5.2.1.0]decane derivatives | Chemistry; Metallurgy | 0 | Expired |
| US5275941A | Process for the preparation of N-protected dialkyl (2S,3S)-3-ethylaspartates | Chemistry; Metallurgy | 0 | Expired |
| US5628988A | Ketotricyclo[5.2.1.0]decane derivatives | Chemistry; Metallurgy | 0 | Expired |
| US6140507A | Method for debenzylation of dibenzylbiotin | Chemistry; Metallurgy | 0 | Expired |
| US5714629A | Process for the preparation of thioglycolic acid alkyl esters | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.