Erwin Spanner
18Patents
9h-index
21Co-inventors
72Inventor score
Filing activity: Feb 20, 1990 → Jun 8, 2015
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5977539A | Optical position-measuring device having reference mark graduation structures with chirp fields | Physics | 27 | Expired |
| US5333048A | Polarizing interferometric displacement measuring arrangement | Physics | 20 | Expired |
| US6535290B1 | Optical position measuring device with a beam splitter | Physics | 20 | Expired |
| US5574560A | Dual-beam interferometer with a phase grating | Physics | 16 | Expired |
| US5711084A | Linear encoder | Physics | 15 | Expired |
| US6369951B1 | Beam splitter assembly and interferometer having a beam splitter assembly | Physics | 14 | Expired |
| US5786931A | Phase grating and method of producing phase grating | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5079418A | Position measuring apparatus with reflection | Physics | 12 | Expired |
| US5206704A | Position measuring apparatus and method of use thereof | Physics | 11 | Expired |
| US5500734A | Photoelectric position measuring system with integral optical circuit having phase shifted interference gratings | Physics | 9 | Expired |
| US6097318A | Position measuring system and method for operating a position measuring system | Physics | 7 | Expired |
| US6265992A | Position measuring system and method for operating a position measuring system | Physics | 6 | Expired |
| US7542149B2 | Optics system for an interferometer that uses a measuring mirror, a reference mirror and a beam deflector | Physics | 4 | Active |
| US6907372B1 | Device for position indication and detection of guidance errors | Physics | 4 | Expired |
| US7701593B2 | Optical position measuring arrangement | Physics | 2 | Active |
| US7639366B2 | Position-measuring device for determining the position of two objects movable with respect to each other along a measuring direction, and method for forming a reference pulse for such a position-measuring device | Physics | 2 | Active |
| US9188424B2 | Interferometer | Physics | 1 | Active |
| US9733068B2 | Optical position measuring device | Physics | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.