Helmut Ritter
55Patents
12h-index
109Co-inventors
87Inventor score
Filing activity: Oct 22, 1974 → Apr 9, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5438082A | Polymer electrolyte membrane, and process for the production thereof | Emerging Cross-Sectional Technologies | 109 | Expired |
| US5561202A | Polymer electrolyte membrane, and process for the production thereof | Emerging Cross-Sectional Technologies | 74 | Expired |
| US8729207B2 | Types of polyester-modified organopolysiloxanes | Chemistry; Metallurgy | 57 | Active |
| US7585983B2 | Alkylenedioxythiophenes and poly(alkylenedioxythiophenes) containing mesogenic groups | Chemistry; Metallurgy | 55 | Expired |
| US5005287A | Process for making a hydrophilic coating on a formed part and safety razor made using this process | Performing Operations; Transporting | 50 | Expired |
| US5741408A | Polymer electrolyte membrane for use in fuel cells and electrolysis cells | Emerging Cross-Sectional Technologies | 41 | Expired |
| US6031015A | Dental materials based on liquid crystalline monomers | Emerging Cross-Sectional Technologies | 32 | Expired |
| US6214488A | Polymer electrolyte membrane and process for the production thereof | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5146660A | Device for air-intermingling multifilament yarns | Textiles; Paper | 20 | Expired |
| US4235768A | Production of readily dispersible titanium dioxide pigments | Chemistry; Metallurgy | 17 | Expired |
| US5010631A | Air nozzle for the interlacing of multifilament yarns | Textiles; Paper | 14 | Expired |
| US6805816B1 | Method of producing &pgr;-conjugated polymers | Chemistry; Metallurgy | 14 | Expired |
| US4010883A | Thread delivery device for textile machines | Performing Operations; Transporting | 8 | Expired |
| US7759454B2 | Process for preparing amides based on polyetheramines and (meth)acrylic acid | Chemistry; Metallurgy | 8 | Active |
| US8329842B2 | Ophthalmological composition and use thereof | Human Necessities | 8 | Active |
| US3991545A | Pneumatic auxiliary device | Performing Operations; Transporting | 7 | Expired |
| US3986325A | Auxiliary pneumatic device | Performing Operations; Transporting | 7 | Expired |
| US4048864A | Drive with continuously adjustable speed variation | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US6800709B2 | Method of preparing polymer particles having narrow particle size distribution | Emerging Cross-Sectional Technologies | 5 | Expired |
| US9993395B2 | Polymer for a glass ionomer cement | Chemistry; Metallurgy | 4 | Active |
| US9877898B2 | Dental materials based on low-odour thiols | Chemistry; Metallurgy | 4 | Active |
| US9682019B2 | Dental composition | Human Necessities | 4 | Active |
| US6609278B1 | Yarn processing device and use thereof | Textiles; Paper | 4 | Expired |
| US4022389A | Process and apparatus for automatically forming a yarn reserve on a wind-up bobbin | Performing Operations; Transporting | 4 | Expired |
| US9999576B2 | Dental composition | Human Necessities | 3 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.