Andreas Franz
37Patents
12h-index
100Co-inventors
84Inventor score
Filing activity: Dec 21, 1990 → Oct 8, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5396328A | Waveguide type displacement interferometer having two reference paths | Physics | 88 | Expired |
| US5631736A | Absolute interferometer measuring process and apparatus having a measuring interferometer, control interferometer and tunable laser | Physics | 58 | Expired |
| US5609761A | Filter medium and process for making same | Performing Operations; Transporting | 40 | Expired |
| US6711524B2 | Method and apparatus for monitoring service-intensive replaceable parts in an assembly | Performing Operations; Transporting | 25 | Expired |
| US5620116A | Rotary vane gate | Performing Operations; Transporting | 25 | Expired |
| US5576537A | Photoelectric position measuring system using gratings having specified dimensions to suppress harmonics | Electricity | 24 | Expired |
| US5521704A | Apparatus and method for measuring absolute measurements having two measuring interferometers and a tunable laser | Physics | 17 | Expired |
| US5574560A | Dual-beam interferometer with a phase grating | Physics | 16 | Expired |
| US6853203B2 | Oil quality measurement device | Physics | 15 | Expired |
| US6472658B2 | Photoelectric position measuring system that optimizes modulation of a scanning device and the intensity of a reference mark signal | Physics | 15 | Expired |
| US5786931A | Phase grating and method of producing phase grating | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5271078A | Device for coupling and/or decoupling beams of light, with an integrated optical component | Physics | 12 | Expired |
| US5184463A | Method of reducing the emission of toxic exhaust gas components in an internal combustion engine | Emerging Cross-Sectional Technologies | 11 | Expired |
| US5583798A | Position measuring method and apparatus for generating periodic signals free of harmonics | Electricity | 10 | Expired |
| US5113066A | Integrated optical sensor arrangement with detecting means, and means for controlling the optical emission wavelength of the light beam source | Electricity | 10 | Expired |
| US5696584A | Phase grating having an unprotected relief structure with a grating structure that causes destructive interference of reflections | Physics | 9 | Expired |
| US5162869A | Apparatus and method having at least one waveguide coupler to create at least two signals having a mutual phase shift not equal to 180 degrees | Physics | 6 | Expired |
| US7713324B2 | Filter | Performing Operations; Transporting | 6 | Active |
| US10596985B2 | Operating method for a filter system and filter system | Performing Operations; Transporting | 3 | Active |
| US10695701B2 | Fuel filter | Performing Operations; Transporting | 3 | Active |
| US9388867B2 | Brake dust collector for motor vehicles | Mechanical Engineering; Lighting; Heating | 3 | Active |
| US8156741B2 | Exhaust gas turbocharger for an internal combustion engine and device for switching an air guiding device of an exhaust gas turbocharger | Emerging Cross-Sectional Technologies | 2 | Active |
| US8501002B2 | Exchangeable filter insert | Performing Operations; Transporting | 2 | Active |
| US8557009B2 | Ceramic filter element and method of manufacture | Emerging Cross-Sectional Technologies | 2 | Active |
| US11605571B2 | Package comprising a substrate, an integrated device, and an encapsulation layer with undercut | Electricity | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.