Erich Hammerschmidt
9Patents
1h-index
18Co-inventors
48Inventor score
Filing activity: Apr 23, 1982 → Apr 30, 2001
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4835243A | Thermotropic aromatic polymers with high elongation at break, processes for their preparation and their use for the production of moulded articles, filaments, fibres and films | Chemistry; Metallurgy | 5 | Expired |
| US4427601A | Process for preparing 1-amino-2-naphthol-4-sulphonic acid (amidol acid) | Chemistry; Metallurgy | 1 | Expired |
| US4426333A | Process for the preparation of 1-benzoylamino-8-hydroxynaphthalene-4,6-disulphonic acid (benzoyl-K acid) | Chemistry; Metallurgy | 1 | Expired |
| US4795596A | 1-Aminomethylnaphthalene-6-sulphonic acid, its preparation and its use | Chemistry; Metallurgy | 1 | Expired |
| US4806619A | Thermotropic aromatic polyesters having a high deflection temperature under load and excellent mechanical properties, a process for their preparation and their use for the production of moldings, filaments, fibres and films | Chemistry; Metallurgy | 0 | Expired |
| US5869735A | Process for the preparation of alkyl aryl ethers containing carboxyl groups | Chemistry; Metallurgy | 0 | Expired |
| US6458954B2 | Process for preparing piperidines | Chemistry; Metallurgy | 0 | Expired |
| US4874892A | Process for the preparation of 6-hydroxynaphthalene-1-carboxylic from 1-aminomethylnaphthalene-6-sulphonic acid | Chemistry; Metallurgy | 0 | Expired |
| US4705652A | Tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.