Sony Precision Technology Inc.
38Patents
0Active
38Granted
33Portfolio score
Filing activity: Sep 3, 1997 → Nov 10, 2003
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5970432A | Apparatus and method for measuring displacement | Physics | 26 | Expired |
| US6578283B2 | Position transducer | Physics | 21 | Expired |
| US6182191A | Recording and reproducing system | Physics | 20 | Expired |
| US6541747B1 | Focal mechanism and method for controlling focal point position, and apparatus and method for inspecting semiconductor wafer | Physics | 20 | Expired |
| US6236200A | Magnetic metal sensor and method for detecting magnetic metal | Physics | 17 | Expired |
| US6407815B2 | Optical displacement measurement system | Physics | 15 | Expired |
| US6980303B2 | Light-emitting/receiving combined unit and displacement sensors using the same | Physics | 14 | Expired |
| US7171039B2 | Defect classification/inspection system | Physics | 13 | Expired |
| US6768426B2 | Position detection apparatus | Physics | 13 | Expired |
| US6145214A | Position detection apparatus | Physics | 12 | Expired |
| US6145213A | Position detection apparatus | Physics | 12 | Expired |
| US6222361A | Position detecting device using varying width magneto-resistive effect sensor | Physics | 12 | Expired |
| US6541960B2 | Position detector utilizing magnetic sensors and a bias magnetic field generator | Physics | 10 | Expired |
| US6580264B2 | Position detector with magnetic core and detection and auxiliary coils | Physics | 10 | Expired |
| US6668996B2 | Electromagnetic clutch | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US6119357A | Scale device | Physics | 9 | Expired |
| US6772101B1 | Position detection apparatus and arithmetic processing unit | Physics | 8 | Expired |
| US6166817A | Optical displacement measurement system for detecting the relative movement of a machine part | Physics | 8 | Expired |
| US7034948B2 | Displacement pickup | Physics | 8 | Expired |
| US6583948B1 | Disc recording/reproducing apparatus and servo signal writing apparatus | Physics | 8 | Expired |
| US6788053B2 | Magnetic flux measuring device | Physics | 6 | Expired |
| US6070132A | Position detecting apparatus | Physics | 5 | Expired |
| US6490807B1 | Position detection apparatus | Physics | 5 | Expired |
| US6879405B2 | Displacement pickup | Physics | 5 | Expired |
| US6031885A | Displacement detecting apparatus | Physics | 4 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.