Inventor · disambiguated record
John R. Hellmann
Also filed as: HELLMANN JOHN R
5 granted patents·1 pending application·77 citations·filing 1991–2013
80Inventor score
Top patents by PatentIndex Score
6 records- 0188US8193128B2Treatment of particles for improved performance as proppantsHELLMANN JOHN R·Filed 2010·Granted Jun 5, 2012·32 cites·22 claims
- 0285US8959954B2Proppants from mineralogical materialPENN STATE RES FOUND·Filed 2013·Granted Feb 24, 2015·6 cites·20 claims
- 0377US7828998B2Material having a controlled microstructure, core-shell macrostructure, and method for its fabricationCARBO CERAMICS INC·Filed 2007·Granted Nov 9, 2010·7 cites·16 claims
- 0472US8359886B2Treatment of melt quenched aluminosilicate glass spheres for application as proppants via devitrification processesPENN STATE RES FOUND·Filed 2009·Granted Jan 29, 2013·2 cites·9 claims
- 0563US5220824AHigh temperature, tube burst test apparatusPENNSYLVANIA RES CORP·Filed 1991·Granted Jun 22, 1993·30 cites·11 claims
- 0644US2009118145A1Method for producing proppant using a dopantCARBO CERAMICS INC·Filed 2008·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →