Inventor · disambiguated record

Harm J. Groen

Also filed as: GROEN HARM J · GROEN HARM JAN

2 granted patents·5 citations·filing 1980–1980

43Inventor score

Technology areasC01P G11B

Files withPHILIPS CORP2

Top patents by PatentIndex Score

2 records

0138US4349385AMethod of preparing a FeOOH pigmentPHILIPS CORP·Filed 1980·Granted Sep 14, 1982·5 cites·9 claims
0222US4425409AMethod of preparing a magnetic pigment of γ-Fe2 O3 particles and recording elementPHILIPS CORP·Filed 1980·Granted Jan 10, 1984·0 cites·11 claims

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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →