Helmut Witteler
50Patents
11h-index
125Co-inventors
81Inventor score
Filing activity: Apr 17, 1997 → May 13, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6063464A | Isosorbide containing polyesters and methods for making same | Emerging Cross-Sectional Technologies | 136 | Expired |
| US6025061A | Sheets formed from polyesters including isosorbide | Emerging Cross-Sectional Technologies | 123 | Expired |
| US5959066A | Polyesters including isosorbide as a comonomer and methods for making same | Chemistry; Metallurgy | 120 | Expired |
| US6126992A | Optical articles comprising isosorbide polyesters and method for making same | Emerging Cross-Sectional Technologies | 93 | Expired |
| US6063495A | Polyester fiber and methods for making same | Emerging Cross-Sectional Technologies | 85 | Expired |
| US6359070B1 | Polyesters including isosorbide as a comonomer blended with other thermoplastic polymers | Chemistry; Metallurgy | 83 | Expired |
| US6197147A | Process for continuous production of membrane-electrode composites | Emerging Cross-Sectional Technologies | 53 | Expired |
| US6140422A | Polyesters including isosorbide as a comonomer blended with other thermoplastic polymers | Chemistry; Metallurgy | 37 | Expired |
| US5906716A | Metallized cation exchange membrane | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6096856A | Polymer electrolytes and process for their production | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6541032B1 | Use of finely divided dye-containing polymers PD as color-imparting constituent in cosmetic compositions | Human Necessities | 15 | Expired |
| US8697834B2 | Polyalkylenepolyamines by homogeneously catalyzed alcohol amination | Chemistry; Metallurgy | 11 | Active |
| US7655279B2 | Carboxylate-containing polymers for metal surface treatment | Performing Operations; Transporting | 10 | Expired |
| US7638469B2 | Methods of increasing permeability in carbonatic rock formations with alkanesulfonic acids | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6214891A | Process for producing a cation-exchanging polymer electrolyte membrane (PEM) | Emerging Cross-Sectional Technologies | 6 | Expired |
| US8048838B2 | MGDA-based powder mixture or granulate mixture | Chemistry; Metallurgy | 4 | Active |
| US7390847B2 | Polymer derivatives for the treatment of metals | Chemistry; Metallurgy | 4 | Expired |
| US7879158B2 | Nitrogenous polymers for metal surface treatment | Performing Operations; Transporting | 4 | Active |
| US6670033B1 | Process and products of purification of anhydrosugar alcohols | Emerging Cross-Sectional Technologies | 4 | Expired |
| US9228148B2 | Method for producing molded bodies from sheet steel galvanized on one or both sides | Emerging Cross-Sectional Technologies | 3 | Active |
| US8986467B2 | Method for passivating metallic surfaces with aqueous compositions comprising surfactants | Chemistry; Metallurgy | 3 | Active |
| US10323215B2 | Solid polymer composition obtained by polymerization of an acid group containing monomer in the presence of a polyether compound | Chemistry; Metallurgy | 2 | Active |
| US6380338B1 | Polymers for cosmetic formulations | Human Necessities | 2 | Expired |
| US7905964B2 | Method for the passivation of metal surfaces with compositions comprising polymers with acid groups and waxes | Emerging Cross-Sectional Technologies | 2 | Active |
| US8927669B2 | Copolymers, method for producing them and their use for treating surfaces | Emerging Cross-Sectional Technologies | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.