Narayan Das
10Patents
8h-index
4Co-inventors
65Inventor score
Filing activity: Dec 17, 1974 → Jul 7, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3964936A | Coating solution for metal surfaces | Chemistry; Metallurgy | 53 | Expired |
| US4470853A | Coating compositions and method for the treatment of metal surfaces | Chemistry; Metallurgy | 28 | Expired |
| US5139586A | Coating composition and method for the treatment of formed metal surfaces | Chemistry; Metallurgy | 20 | Expired |
| US4422886A | Surface treatment for aluminum and aluminum alloys | Chemistry; Metallurgy | 18 | Expired |
| US6027579A | Non-chrome rinse for phosphate coated ferrous metals | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5279677A | Rinse aid for metal surfaces | Chemistry; Metallurgy | 10 | Expired |
| US4285223A | Phosphate and ester coating method | Chemistry; Metallurgy | 9 | Expired |
| US4391652A | Surface treatment for aluminum and aluminum alloys | Chemistry; Metallurgy | 8 | Expired |
| US5332452A | Coating composition and method for the treatment of formed metal surfaces | Chemistry; Metallurgy | 8 | Expired |
| US4381064A | Coated sheet material and container therefrom | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.