Inventor · disambiguated record
Leonardus Johannes Hubertus Erkens
Also filed as: ERKENS LEONARDUS J H · ERKENS LEONARDUS JOHANNES HUBE
11 granted patents·91 citations·filing 1976–2002
89Inventor score
Top patents by PatentIndex Score
11 records- 0183US5123965AProcess for stabilizing bismuth vanadate pigments against attack by hydrochloric acidCIBA GEIGY CORP·Filed 1990·Granted Jun 23, 1992·28 cites·6 claims
- 0273US6734231B2Easily distributable pigment compositionsCIBA SC HOLDING AG·Filed 2002·Granted May 11, 2004·15 cites·18 claims
- 0358US5976238ABismuth vanadate pigment powder mixturesCIBA SC HOLDING AG·Filed 1997·Granted Nov 2, 1999·16 cites·11 claims
- 0451US5186748AProcess for the preparation of bismuth vanadate pigments, and novel bismuth vanadate pigments of high color strengthCIBA GEIGY CORP·Filed 1992·Granted Feb 16, 1993·13 cites·15 claims
- 0540US6444025B1Red-tinged bismuth vanadate pigmentsCIBA SC HOLDING AG·Filed 1999·Granted Sep 3, 2002·7 cites·19 claims
- 0640US5853472ATransparent bismuth vanadate pigmentsCIBA SC HOLDING AG·Filed 1997·Granted Dec 29, 1998·7 cites·12 claims
- 0733US4113508AIron blue pigment composition and process for its productionHERCULES INC·Filed 1977·Granted Sep 12, 1978·3 cites·10 claims
- 0826US5007963ANovel process for the preparation of lead molybdate pigments and novel lead molybdate pigmentsCIBA GEIGY CORP·Filed 1988·Granted Apr 16, 1991·1 cites·12 claims
- 0925US4872915AOrthorhombic lead chromate pigments of greenish hueCIBA GEIGY CORP·Filed 1987·Granted Oct 10, 1989·0 cites·14 claims
- 1023US4921541AOrthorhombic greenish-tinged lead chromate pigmentsCIBA GEIGY CORP·Filed 1988·Granted May 1, 1990·1 cites·13 claims
- 1123US4077973ASynthesis of metal phthalocyaninesHERCULES INC·Filed 1976·Granted Mar 7, 1978·0 cites·9 claims
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