Friedrich Esper
18Patents
12h-index
27Co-inventors
74Inventor score
Filing activity: May 2, 1974 → May 23, 1990
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4535487A | Endoprosthesis shaft | Human Necessities | 51 | Expired |
| US4334974A | Electrochemical oxygen sensor, particularly for use with exhaust gases of internal combustion engines, and especially for polarographic application | Physics | 39 | Expired |
| US4418661A | Glow plug, particularly for diesel engine | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US4221650A | Solid electrolyte oxygen sensors | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4320080A | Method to manufacture soft magnetic pressed bodies | Emerging Cross-Sectional Technologies | 26 | Expired |
| US4019914A | Method of manufacturing .alpha.-alumina | Chemistry; Metallurgy | 25 | Expired |
| US4356571A | Prosthetic device | Human Necessities | 23 | Expired |
| US4268468A | Method of making a medical prosthesis | Performing Operations; Transporting | 21 | Expired |
| US4339320A | Heated gas composition sensor structure | Physics | 21 | Expired |
| US4539503A | Rapid-heating, high-temperature-stable spark plug for internal combustion engines | Electricity | 15 | Expired |
| US5194099A | Sinter magnet based on Fe-Nd-B | Chemistry; Metallurgy | 14 | Expired |
| US4183798A | Stabilized zirconium dioxide compositions and oxygen sensors utilizing said compositions | Chemistry; Metallurgy | 12 | Expired |
| US4128420A | High-strength iron-molybdenum-nickel-phosphorus containing sintered alloy | Chemistry; Metallurgy | 11 | Expired |
| US4532492A | Temperature-compensated, oxygen-content gas sensor | Physics | 9 | Expired |
| US4618351A | Device for cleaning of gases | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4503348A | Magnetic transducer | Electricity | 3 | Expired |
| US3959002A | Method of manufacturing white furnace boats for firing ceramic articles and novel furnace boats | Chemistry; Metallurgy | 3 | Expired |
| US4533392A | High strength sintered alloy | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.