Alfons Spies
22Patents
12h-index
12Co-inventors
78Inventor score
Filing activity: Jul 24, 1975 → Mar 28, 2001
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5956659A | Arrangement and method for the automatic correction of error-containing scanning signals of incremental position-measuring devices | Physics | 34 | Expired |
| US5386642A | Position measuring instrument | Physics | 31 | Expired |
| US6542088B1 | Multiturn rotary encoder with multiple code carriers coupled by a reduction gear | Physics | 31 | Expired |
| US6018881A | Position measuring system | Physics | 29 | Expired |
| US5747995A | Magnetic position measuring device using Hall elements as sensors and method for its operation | Physics | 26 | Expired |
| US4595991A | Position measuring method and apparatus | Electricity | 26 | Expired |
| US4612502A | Magnetic length or angle measuring system having improved magnetic sensor arrangement | Physics | 25 | Expired |
| US5120132A | Position measuring apparatus utilizing two-beam interferences to create phase displaced signals | Physics | 22 | Expired |
| US4792678A | Photoelectric angle measuring device | Physics | 20 | Expired |
| US5009506A | Photoelectric position-measuring arrangement having a plurality of shiftable grids | Physics | 19 | Expired |
| US4120093A | Planar measuring instrument | Physics | 16 | Expired |
| US5627466A | Position measuring device having a sensor for sensing the distance between a scanning unit and a scale | Physics | 15 | Expired |
| US4819546A | Device for measuring feed movement | Physics | 10 | Expired |
| US4490914A | Error correction system for position measuring instruments | Physics | 10 | Expired |
| US5619132A | Position measuring device employing primary and auxiliary magnetic fields | Physics | 9 | Expired |
| US4260205A | Gas bearing | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US5841275A | Magnetic measuring system having a particularly oriented auxiliary field | Physics | 6 | Expired |
| US5734266A | Two piece measurement representation with magnetic elements magnetized with the same orientation | Physics | 6 | Expired |
| US4051657A | Spinning-ring bearing and support | Textiles; Paper | 5 | Expired |
| US4030282A | Resilient support for spinning-ring or twisting-ring bearing | Textiles; Paper | 5 | Expired |
| US4251119A | Gas bearing for rapidly rotating parts | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US5111040A | Photoelectric device for position measuring | Physics | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.