John R. Hellmann
5Patents
3h-index
9Co-inventors
50Inventor score
Filing activity: Aug 20, 1991 → Jan 17, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8193128B2 | Treatment of particles for improved performance as proppants | Chemistry; Metallurgy | 31 | Active |
| US5220824A | High temperature, tube burst test apparatus | Physics | 9 | Expired |
| US7828998B2 | Material having a controlled microstructure, core-shell macrostructure, and method for its fabrication | Chemistry; Metallurgy | 5 | Active |
| US8959954B2 | Proppants from mineralogical material | Chemistry; Metallurgy | 2 | Active |
| US8359886B2 | Treatment of melt quenched aluminosilicate glass spheres for application as proppants via devitrification processes | Emerging Cross-Sectional Technologies | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.