Sperry Rail Service
2Patents
0Active
2Granted
25Portfolio score
Filing activity: Aug 20, 1997 → Apr 7, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5970438A | Method and apparatus for testing rails for structural defects | Physics | 72 | Expired |
| US5837880A | Compact ultrasonic calibration block | Physics | 22 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.