Hans-Peter Letschert
11Patents
5h-index
8Co-inventors
59Inventor score
Filing activity: Oct 14, 1993 → Jun 4, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5439660A | Oxonitrides of the formula LnTaOn.sub.2 with enhanced brightness and a process for their production and use | Chemistry; Metallurgy | 10 | Expired |
| US6294009A | Tantalum (V) nitride pigment, process for producing it and its use | Chemistry; Metallurgy | 9 | Expired |
| US5766336A | Colored pigments based on oxide-nitrides, the preparation and use thereof | Chemistry; Metallurgy | 8 | Expired |
| US6004391A | Pigments for the production of purple ceramic decoration, process for the production thereof and use thereof | Chemistry; Metallurgy | 6 | Expired |
| US5569322A | Process for using tantalum (V) nitride as a pigment and the colored products produced thereby | Chemistry; Metallurgy | 6 | Expired |
| US5693102A | Oxonitrides of the formula LnTaON.sub.2 with enhanced brightness and a process for their use | Chemistry; Metallurgy | 5 | Expired |
| US5376349A | Method of producing tantalum (V) nitride | Chemistry; Metallurgy | 4 | Expired |
| US6235103A | Tantalum (V) nitride pigments, process for the production thereof and use thereof | Chemistry; Metallurgy | 3 | Expired |
| US9187617B1 | Nickel-free green pigment | Chemistry; Metallurgy | 2 | Active |
| US6379449B1 | Process for the production of yellow to red pigments based on nitrides and oxidenitrides | Chemistry; Metallurgy | 2 | Expired |
| US6673473B2 | Display screen, in particular a color display screen, coating of the same and means for producing the coating | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.