Sony Magnescale Inc.
44Patents
0Active
44Granted
34Portfolio score
Filing activity: Oct 15, 1982 → Apr 21, 1997
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4676645A | Optical instrument for measuring displacement | Physics | 57 | Expired |
| US5225918A | Hologram scale, apparatus for making hologram scale, moving member having hologram scale assembled hologram scale and apparatus for making assembled hologram scale | Physics | 37 | Expired |
| US5016359A | Linear scale arrangement | Physics | 29 | Expired |
| US5325349A | Hard disc drive and a servo signal writing apparatus | Physics | 26 | Expired |
| US5148403A | Production of prerecorded tape cassettes | Physics | 25 | Expired |
| US5243280A | Magnetic sensor and position detector | Physics | 25 | Expired |
| US5943639A | Displacement detection apparatus including an error correction system | Physics | 16 | Expired |
| US5488782A | Scale plate arrangement | Physics | 16 | Expired |
| US4843729A | Mounting structure for magnetic linear scale unit | Physics | 16 | Expired |
| US5172250A | Hologram scale having moisture resistance | Physics | 16 | Expired |
| US5366174A | Tape winding apparatus | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4649648A | Linear scale | Physics | 15 | Expired |
| US5635833A | Magnetic linear scaling device having protective resin tape | Physics | 15 | Expired |
| US4484391A | Magnetic scaling device | Physics | 14 | Expired |
| US5909115A | Position detecting apparatus employing magnetoresistance effect elements connected in series | Physics | 13 | Expired |
| US5475209A | Displacement measurement apparatus having first and second servo control circuits and a zone decision circuit | Physics | 11 | Expired |
| US5485407A | Interpolation device for scale arrangement | Physics | 10 | Expired |
| US5637868A | Fixed point detecting device using detection of light diffracted by holographic diffraction gratings | Physics | 10 | Expired |
| USD310041S | Magnetic measuring scale | General | 9 | Expired |
| US5706219A | Interpolation device | Physics | 9 | Expired |
| US5814732A | Laser doppler speed measuring apparatus | Physics | 8 | Expired |
| US4663588A | Detector for use for measuring dimensions of an object | Physics | 8 | Expired |
| US4558312A | Position detecting device | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5499096A | Optical instrument and measurement for measuring displacement of scale using different order diffraction of a diffraction grating | Physics | 7 | Expired |
| US5663643A | Position detecting apparatus using offset calculated from sum of three-phase signals | Emerging Cross-Sectional Technologies | 6 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.