Werner Topfl
41Patents
10h-index
24Co-inventors
71Inventor score
Filing activity: Mar 3, 1976 → Feb 17, 1993
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4634465A | Fused N-phenylsulfonyl-N'-pyrimidinylureas and N-phenylsulfonyl-N'triazinylureas | Chemistry; Metallurgy | 54 | Expired |
| US5215570A | Sulfamoylphenylureas | Chemistry; Metallurgy | 35 | Expired |
| US4518776A | Process for producing sulfonylureas | Chemistry; Metallurgy | 31 | Expired |
| US4602936A | Herbicidal sulfonylureas | Chemistry; Metallurgy | 30 | Expired |
| US4521597A | Process for producing sulfonylureas having a herbicidal action | Chemistry; Metallurgy | 21 | Expired |
| US4478635A | N-Arylsulfonyl-N'-pyrimidinylureas | Chemistry; Metallurgy | 21 | Expired |
| US4664695A | N-phenylsulfonyl-N'-pyrimidinylureas as herbicides and plant growth regulants | Chemistry; Metallurgy | 19 | Expired |
| US4632695A | N-phenylsulfonyl-N'-triazinylureas as herbicides and plant growth regulants | Chemistry; Metallurgy | 15 | Expired |
| US4618363A | N-phenylsulfonyl-N'-triazinylureas | Chemistry; Metallurgy | 10 | Expired |
| US4904300A | Imidazole derivatives | Chemistry; Metallurgy | 10 | Expired |
| US4551531A | 4-Difluoromethoxy-2-amino-pyrimidines | Chemistry; Metallurgy | 8 | Expired |
| US4639264A | Herbicidal N-arylsulfonyl-N'-(4-mercaptomethylpyrimdinyl)-ureas | Chemistry; Metallurgy | 8 | Expired |
| US4559078A | Herbicidal and growth regulator phosphorus-containing N-phenylsulfonyl-N'-pyrimidinylureas and N-phenylsulfonyl-N'-triazinylureas | Chemistry; Metallurgy | 7 | Expired |
| US4685961A | Herbicidal sulfonylureas | Chemistry; Metallurgy | 7 | Expired |
| US4656273A | Process for producing sulfonylureas | Chemistry; Metallurgy | 5 | Expired |
| US4740236A | N-sulfonyl-imino-thiocarbonic acid diesters as herbicide antagonists for the protection of rice crops | Chemistry; Metallurgy | 5 | Expired |
| US4017638A | Iso-(thio)-urea derivatives | Chemistry; Metallurgy | 4 | Expired |
| US5342823A | Sulfonylureas | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US4677217A | Phosphorous-containing phenylsulfonamides | Chemistry; Metallurgy | 3 | Expired |
| US4992434A | Microbicidal composition | Chemistry; Metallurgy | 2 | Expired |
| US4940792A | Herbicidal sulfonylureas | Chemistry; Metallurgy | 2 | Expired |
| US4921955A | Process for the synthesis of 1-substituted imidazole-5-carboxylic acids and carboxylic acid derivatives | Chemistry; Metallurgy | 2 | Expired |
| US5135927A | Microbicidal composition | Chemistry; Metallurgy | 2 | Expired |
| US4764203A | Herbicidal sulfonylureas | Chemistry; Metallurgy | 2 | Expired |
| US4098900A | N,N'-Diphenyl-guanidine derivatives | Chemistry; Metallurgy | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.