Eugen Konrad
47Patents
15h-index
30Co-inventors
81Inventor score
Filing activity: Sep 30, 1974 → Feb 12, 1996
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4883656A | Composition and method for the oxidative dyeing of hair | Human Necessities | 49 | Expired |
| US4855130A | Hair treating compositions and processes for improving the condition of hair | Physics | 45 | Expired |
| US4725282A | Oxidative hair dyeing composition based upon a carrier of low viscosity | Human Necessities | 41 | Expired |
| US5021066A | Oxidative hair dye composition based on a gel vehicle and a process to dye hair | Human Necessities | 41 | Expired |
| US4528283A | Cosmetic composition based upon chitosan derivatives, new chitosan derivatives as well as processes for the production thereof | Human Necessities | 36 | Expired |
| US4840639A | Agent for dyeing hair | Human Necessities | 32 | Expired |
| US4822598A | Cosmetic agent on the basis of quaternary chitosan derivatives, novel quaternary chitosan derivatives as well as processes for making same | Human Necessities | 29 | Expired |
| US4202881A | Hair shampoo and conditioning lotion | Human Necessities | 27 | Expired |
| US4134412A | Hair setting lotion containing a chitosan derivative | Human Necessities | 24 | Expired |
| US4780310A | Cosmetic compositions based upon N-hydroxypropyl-chitosans, new N-hyroxypropyl-chitosans, as well as processes for the production thereof | Human Necessities | 24 | Expired |
| US4396392A | Method for the coloring of hair | Human Necessities | 22 | Expired |
| US4772689A | Quaternary hydroxy-propyl-substituted chitosan derivatives, cosmetic compositions based thereon and processes for the production thereof | Emerging Cross-Sectional Technologies | 20 | Expired |
| US3975515A | Reducing the alkali concentration in hair treating compositions | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4660580A | Process for the permanent shaping of the regrowth of hair and composition therefore | Human Necessities | 19 | Expired |
| US4772690A | Quaternary hydroxyethyl-substituted chitosan derivatives, cosmetic compositions based thereon and processes for the production thereof | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4752467A | Hair treatment agent and method for improving the conditon of hair | Human Necessities | 15 | Expired |
| US4797130A | Oxidative hair dye composition based on 4-amino-2-aminomethyl-phenols | Chemistry; Metallurgy | 15 | Expired |
| US4845204A | Cosmetic compositions on the basis of alkyl-hydroxypropyl-substituted chitosan derivatives, new chitosan derivatives and processes for the production thereof | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4854935A | 5-alkoxy-2,4-diamino-alkyl-benzenes and hairdye compositions based on 5-alkoxy-2,4-diamino-alkyl-benzenes | Chemistry; Metallurgy | 14 | Expired |
| US4931271A | Cosmetic compostions based upon N-hydroxybutyl-chitosans, N-hydroxybutyl-chitosans as well as processes for the production thereof | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4971784A | Preserved hair-and body-cleaning agent and the use of a preservative combination | Human Necessities | 14 | Expired |
| US4921949A | Process for making quaternary chitosan derivatives for cosmetic agents | Human Necessities | 13 | Expired |
| US4395262A | Hair dyeing agent | Human Necessities | 13 | Expired |
| US5587174A | Cosmetic composition for treating skin and hair containing apple wax and methods of making them | Human Necessities | 10 | Expired |
| US4452603A | Process for dyeing hair and composition therefor | Textiles; Paper | 8 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.