Quantum Engineering, Inc.
29Patents
2Active
29Granted
34Portfolio score
Filing activity: Sep 18, 1990 → Nov 15, 2006 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6996461B2 | Method and system for ensuring that a train does not pass an improperly configured device | Performing Operations; Transporting | 65 | Expired |
| US6865454B2 | Train control system and method of controlling a train or trains | Performing Operations; Transporting | 65 | Expired |
| US6112142A | Positive signal comparator and method | Performing Operations; Transporting | 63 | Expired |
| US6863246B2 | Method and system for automated fault reporting | Performing Operations; Transporting | 63 | Expired |
| US6845953B2 | Method and system for checking track integrity | Performing Operations; Transporting | 62 | Expired |
| US6609049B1 | Method and system for automatically activating a warning device on a train | Performing Operations; Transporting | 62 | Expired |
| US6957131B2 | Positive signal comparator and method | Performing Operations; Transporting | 60 | Expired |
| US6903658B2 | Method and system for ensuring that a train operator remains alert during operation of the train | Performing Operations; Transporting | 56 | Expired |
| US6824110B2 | Method and system for automatically activating a warning device on a train | Performing Operations; Transporting | 56 | Expired |
| US7079926B2 | Train control system and method of controlling a train or trains | Performing Operations; Transporting | 56 | Expired |
| US6915191B2 | Method and system for detecting when an end of train has passed a point | Performing Operations; Transporting | 51 | Expired |
| US6853888B2 | Lifting restrictive signaling in a block | Performing Operations; Transporting | 51 | Expired |
| US7036774B2 | Method and system for checking track integrity | Performing Operations; Transporting | 47 | Expired |
| US7092801B2 | Train control system and method of controlling a train or trains | Performing Operations; Transporting | 43 | Expired |
| US7467032B2 | Method and system for automatically locating end of train devices | Performing Operations; Transporting | 41 | Expired |
| US6978195B2 | Train control system and method of controlling a train or trains | Performing Operations; Transporting | 39 | Expired |
| US7092800B2 | Lifting restrictive signaling in a block | Performing Operations; Transporting | 35 | Expired |
| US7024289B2 | Train control system and method of controlling a train or trains | Performing Operations; Transporting | 34 | Expired |
| US7142982B2 | System and method for determining relative differential positioning system measurement solutions | Performing Operations; Transporting | 24 | Expired |
| US7096096B2 | Method and system for automatically locating end of train devices | Performing Operations; Transporting | 16 | Expired |
| US6701228B2 | Method and system for compensating for wheel wear on a train | Performing Operations; Transporting | 14 | Expired |
| US7593795B2 | Method and system for compensating for wheel wear on a train | Performing Operations; Transporting | 13 | Active |
| US7200471B2 | Train control system and method of controlling a train or trains | Performing Operations; Transporting | 13 | Active |
| US7236860B2 | Method and system for ensuring that a train does not pass an improperly configured device | Performing Operations; Transporting | 11 | Expired |
| US6970774B2 | Method and system for compensating for wheel wear on a train | Performing Operations; Transporting | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.