Siegfried Schwerin
4Patents
2h-index
8Co-inventors
37Inventor score
Filing activity: Nov 11, 1975 → May 14, 1992
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4515639A | Azo pigment formulations | Chemistry; Metallurgy | 12 | Expired |
| US4048152A | Modified form of disazo pigment CI 20040 | Chemistry; Metallurgy | 2 | Expired |
| US5266682A | Nitrogen-containing surface-active agents | Chemistry; Metallurgy | 2 | Expired |
| US4939238A | Nitrogen-containing condensation products based on unmodified or modified natural resins, process for the preparation thereof and the use thereof | Chemistry; Metallurgy | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.