Koyo Engineering Co., Ltd.
7Patents
1Active
7Granted
31Portfolio score
Filing activity: Feb 25, 1992 → Nov 14, 2006 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6580541B1 | System and method for transmitting information for amphibious traveling vehicle and system for controlling operation of the vehicle | Performing Operations; Transporting | 22 | Expired |
| US5775226A | Underwater and land travel vehicle | Performing Operations; Transporting | 17 | Expired |
| US5215016A | Rail type underwater travel vehicle | Human Necessities | 12 | Expired |
| US6471857B1 | Filter apparatus with sand filter bed | Performing Operations; Transporting | 11 | Expired |
| US6058848A | Underwater and land travel system | Performing Operations; Transporting | 9 | Expired |
| US6882459B2 | Photoreactive devices, translucent members, ornaments, anticorrosive devices, devices for reducing oxygen and devices for controlling growth of microorganisms | Emerging Cross-Sectional Technologies | 1 | Expired |
| US8673456B2 | Composite plated film and laminated film | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.