Walter Helmling
16Patents
3h-index
9Co-inventors
45Inventor score
Filing activity: Aug 27, 1986 → Jul 11, 1995
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5003053A | Water-soluble monoazo compounds containing a p-aminophenylamino- and chloro- or fluoro-substituted triazinylamino group and a fiber-reactive group selected from the vinylsulfone series, suitable as dyestuffs | Chemistry; Metallurgy | 9 | Expired |
| US4786728A | Water-soluble triphendioxazine compounds | Chemistry; Metallurgy | 5 | Expired |
| US4785099A | Water-soluble triphendioxazine compounds | Chemistry; Metallurgy | 4 | Expired |
| US4774333A | Water-soluble triphendioxazine compounds and sulfonyl-containing precursors thereof, processes for the preparation thereof and use of the triphendioxazines as dyes | Chemistry; Metallurgy | 2 | Expired |
| US4851527A | Water-soluble triphendioxazine compounds | Chemistry; Metallurgy | 2 | Expired |
| US4782150A | Water-soluble triphendioxazine compounds | Chemistry; Metallurgy | 2 | Expired |
| US4898944A | Precursors for the preparation of water-soluble triphendioxazine dyestuffs | Chemistry; Metallurgy | 2 | Expired |
| US5350838A | High temperature process for preparing fiber reactive dyes | Chemistry; Metallurgy | 1 | Expired |
| US5393884A | Fiber reactive anthraquinone dyes | Chemistry; Metallurgy | 1 | Expired |
| US5484459A | Mixture of water soluble reactive dyes and their use | Chemistry; Metallurgy | 1 | Expired |
| US4885385A | Sulfonyl containing compounds suitable as precurors for water-soluble fiber-reactive triphendioxazine compounds | Chemistry; Metallurgy | 1 | Expired |
| US4816574A | Water-soluble triphendioxazine compounds | Chemistry; Metallurgy | 1 | Expired |
| US5563248A | Fiber reactive formazan dyes containing a vinyl sulfonyl reactive group | Emerging Cross-Sectional Technologies | 1 | Expired |
| US5539109A | Fiber-reactive triphenodioxazine dyes | Chemistry; Metallurgy | 0 | Expired |
| US5532362A | Fiber-reactive triphenodioxazine dyes | Chemistry; Metallurgy | 0 | Expired |
| US4895954A | Precursors for synthesis of triphendioxazine dyestuffs | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.