HERZOG CONTRACTING CORP.
30Patents
9Active
30Granted
44Portfolio score
Filing activity: Apr 28, 1978 → Mar 11, 2014 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5386727A | Dynamic rail longitudinal stress measuring system | Physics | 76 | Expired |
| US5657700A | Railroad hopper car with ballast distributing blades and remote control system | Emerging Cross-Sectional Technologies | 25 | Expired |
| US6526339B1 | GPS controlled multiple source material application | Performing Operations; Transporting | 24 | Expired |
| US4190394A | Method for loading and unloading railroad cars | Fixed Constructions | 24 | Expired |
| US4175902A | Apparatus for loading and unloading railroad cars | Fixed Constructions | 23 | Expired |
| US7152347B2 | Method and apparatus for applying railway ballast | Fixed Constructions | 21 | Expired |
| US5361704A | Railroad track laying system with multiple railroad tie handling | Fixed Constructions | 20 | Expired |
| US7707944B2 | Method and apparatus for applying railway ballast | Fixed Constructions | 18 | Active |
| US6981452B2 | Method and apparatus for unloading ribbon rails from rail cars | Fixed Constructions | 17 | Expired |
| US5423268A | Railroad hopper car with ballast distributing blade and hopper door and blade control apparatus and method | Fixed Constructions | 17 | Expired |
| US5289780A | Material handling railroad freightcar-mounted gantry and crane with toppling prevention and supplemental support upon derailment | Performing Operations; Transporting | 15 | Expired |
| USRE36685E | Railroad hopper car with ballast distributing blades and remote control system | General | 14 | Expired |
| US5311822A | Ballast hopper door control apparatus and method with independently and selectively actuated motors in response to uniquely coded signals | Fixed Constructions | 12 | Expired |
| US5522543A | Water truck with exhaust gas pressurization system | Emerging Cross-Sectional Technologies | 11 | Expired |
| US8181577B2 | Rail train | Emerging Cross-Sectional Technologies | 11 | Active |
| US6561742B1 | Loading and unloading apparatus for railcars | Fixed Constructions | 11 | Expired |
| US4921732A | Railroad tie service vehicle and method for spray application of a preservative | Fixed Constructions | 10 | Expired |
| US8096384B2 | Safety line anchor | Human Necessities | 10 | Active |
| US5243918A | Railroad track laying system with multiple railroad tie handling | Fixed Constructions | 9 | Expired |
| US5628606A | Loading/unloading apparatus for railroad cars | Fixed Constructions | 8 | Expired |
| US6704626B1 | Logistics system and method with position control | Performing Operations; Transporting | 8 | Expired |
| US7707943B2 | Self-propelled rail unloading machine | Emerging Cross-Sectional Technologies | 7 | Active |
| US7765935B2 | Rail threading mechanism | Emerging Cross-Sectional Technologies | 7 | Active |
| US7437997B2 | Method for delivering replacement rail ties using GPS techniques | Fixed Constructions | 7 | Active |
| US5275506A | Perforated drainpipe for railway decks | Fixed Constructions | 7 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.