Fritz Engelhardt
35Patents
15h-index
59Co-inventors
84Inventor score
Filing activity: Sep 30, 1977 → May 29, 2001
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6472478B1 | Process for crosslinking hydrogels with bis- and poly-2- oxazolidinones | Emerging Cross-Sectional Technologies | 176 | Expired |
| US6559239B1 | Method for the secondary cross-linking of hydrogels with N-acyl-2-oxazolidinones | Chemistry; Metallurgy | 157 | Expired |
| US6657015B1 | Method for the secondary cross-linking of hydrogels with 2-oxotetrahydro-1,3-oxazines | Chemistry; Metallurgy | 157 | Expired |
| US6503979B1 | Method for cross-linking hydrogels with bis- and poly-2-oxazolidinones | Emerging Cross-Sectional Technologies | 145 | Expired |
| US6417425B1 | Absorbent article and process for preparing an absorbent article | Textiles; Paper | 95 | Expired |
| US5731365A | Hydrophilic, highly swellable hydrogels | Emerging Cross-Sectional Technologies | 60 | Expired |
| US6565768B1 | Method for producing water-swellable hydorphilic polymers, said polymers and use thereof | Emerging Cross-Sectional Technologies | 48 | Expired |
| US6297335A | Crosslinked, hydrophilic, highly swellable hydrogels, production thereof and use thereof | Chemistry; Metallurgy | 46 | Expired |
| US5840321A | Hydrophilic, highly swellable hydrogels | Chemistry; Metallurgy | 27 | Expired |
| US5510436A | Water-soluble copolymers useful in drilling fluids | Chemistry; Metallurgy | 25 | Expired |
| US5684104A | Water-swellable hydrophilic polymers | Chemistry; Metallurgy | 20 | Expired |
| US5530093A | Polycondensates containing phosphinic and phosphonic acid groups | Textiles; Paper | 20 | Expired |
| US4576973A | Copolymer, process for its preparation and its use as a sorbent | Performing Operations; Transporting | 18 | Expired |
| US5276248A | Process for the storage and transportation of liquid hydrocarbons | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5668236A | Hydrophilic highly swellable hydrogels | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5945495A | Use of surfactants in the drying of hydrophilic highly swellable hydrogels | Chemistry; Metallurgy | 15 | Expired |
| US4588413A | Process for producing dyeings with reactive dyestuffs | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4877540A | Methylolated and optionally etherified urethanes containing fluoroalkyl ligands | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5258448A | Absorbent polymers, manufacturing process and their use in particular for sanitary articles | Human Necessities | 12 | Expired |
| US4552905A | Copolymer, a process for its preparation and its use as a sorbent | Emerging Cross-Sectional Technologies | 12 | Expired |
| US6107432A | Water-swellable, hydrophilic polymer compositions | Chemistry; Metallurgy | 12 | Expired |
| US6150477A | Process for the preparation of hydrophilic hydrogels of high swelling capacity | Chemistry; Metallurgy | 10 | Expired |
| US5274048A | Use of glycidyl phosphonates as crosslinkers in the preparation of hydrogels | Chemistry; Metallurgy | 6 | Expired |
| US4168145A | Branched low molecular weight polyesters levelling agents for dyestuff | Textiles; Paper | 5 | Expired |
| US4753999A | Copolymer, process for its preparation, and its use | Textiles; Paper | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.