Inventor · Amsterdam, NL

Frank Janssen

32Patents
3h-index
53Co-inventors
66Inventor score

Filing activity: Oct 26, 1976 → Apr 19, 2021

Most-cited inventions

PatentTitleAreaCited byStatus
US4072629A Regeneration of alkene disproportionation catalyst Emerging Cross-Sectional Technologies 4 Expired
US9402795B2 Multi-tonal one-step dyes Human Necessities 3 Active
US9445977B2 Multi-tonal one step dyeing Human Necessities 3 Active
US7825268B2 Alkoxylactones, alkoxylactams and alkoxythiolactams for controlling processes based on microbial interaction Human Necessities 3 Active
US4940827A Catalyst system for olefin disproportionation Chemistry; Metallurgy 2 Expired
US9402797B2 Multi-tonal one step dyes III Human Necessities 2 Active
US8845759B2 Reduction of ammonia smell in substances for oxidative dyeing and/or lightening keratin fibres Human Necessities 2 Active
US9789052B2 Polymer-containing transparent bleaching compositions with proteins and/or silicone oils Human Necessities 1 Active
US8734530B2 Colorants in foam form Human Necessities 1 Active
US7294727B2 Catalyst preparation Performing Operations; Transporting 1 Expired
US8425623B2 Thickened oxidation preparations Human Necessities 1 Active
US8858653B2 Color intensification by polyquaternium Human Necessities 1 Active
US8882854B2 Reduction of ammonia odor when coloring and/or lightening hair Human Necessities 1 Active
US4916102A Catalyst system for olefin disproportionation Chemistry; Metallurgy 1 Expired
US8668745B2 Brightening agent comprising acylpyridinium compounds and defined alkalizing agents Human Necessities 1 Active
US10005985B2 Copolymers containing siloxane groups as soil-releasing agents Chemistry; Metallurgy 0 Active
US8551190B2 Process for producing a colorant for keratin fibers Human Necessities 0 Active
US9282798B2 Lightening process with blonding mousse Human Necessities 0 Active
US8545575B2 Process for producing a colorant for keratin fibers Human Necessities 0 Active
US8801805B2 Agent comprising hydrogen peroxide having improved viscosity adjustment Human Necessities 0 Active
US10577566B2 6-desoxy-6-amino-celluloses as soil release agents Chemistry; Metallurgy 0 Active
US9789053B2 Transparent bleaching compositions with proteins and/or silicone oils Human Necessities 0 Active
US12195701B2 Soluble laundry detergent sheets with textile stiffening agents Chemistry; Metallurgy 0 Active
US9511009B2 Reduction of the autoxidation of agents for the oxidative dyeing and/or bleaching of keratin fibers Human Necessities 0 Active
US8597371B2 Lightening agent comprising acyl pyridinium compounds and cationic polysaccharides Human Necessities 0 Active

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.