Related: Hearing Set in Stemco-ATDynamics Complaint vs. Ridge’s Green Tail Device
Stemco and Ridge Settle Patent Infringement Dispute
Stemco and Ridge have entered into a settlement and patent license agreement, dismissing Stemco’s patent infringement suit against Ridge’s GreenTail aerodynamic device.
by Staff
April 28, 2016
1 min to read
Stemco and Ridge have entered into a settlement and patent license agreement, dismissing Stemco’s patent infringement suit against Ridge’s GreenTail aerodynamic device.
Stemco filed a suit last year alleging that Ridge had infringed on patents involving ATDynamic’s TrailerTail aerodynamic device with Ridge's GreenTail device. As part of the settlement, the two companies have asked the court to dismiss all claims and counterclaims in the litigation.
The terms of the settlement are confidential but as a result Ridge is now licensed to use the Stemco patents and will resume making and selling GreenTail devices.
Late last year, a court granted Stemco a preliminary injunction against Ridge to stop manufacturing and selling its GreenTail device while the lawsuit was ongoing. Stemco said it was given the injunction because the court had seen the validity of its allegations.
For its part, Ridge maintained that the company did not infringe on the ATDynamics patents and denied the claims in the lawsuit.
More Fuel Smarts
New Agentic Predictive Maintenance Report Demonstrates How Degraded Aftertreatment Systems Waste Fuel
Questar analyzed a large mixed-class fleet and discovered it was wasting as much as $30 in fuel per vehicle, per day, because of mechanically degraded aftertreatment systems.
Read More →
New York City's Microhub Project is Delivering Results
Trucking, last-mile delivery companies, and environmental advocates like what they are seeing so far with New York's microhub program.
Read More →
Lessons Learned About Alternative Fuels: Start Small, Stay Flexible
Practical advice on adopting alternative fuels and ZEVs from HDT's 2026 Top Green Fleets, from renewable diesel and natural gas to electric trucks.
Read More →
Kempower Adds Flex EV Charger to Help Support Transition to Megawatt Charging
The Kempower Mega Satellite Flex has both a CCS and MCS connector, allowing operators to serve both types of heavy-duty vehicles.
Read More →
Hino Adds Electric Class 6/7 Truck
Hino says the Le Series is an important step in the company's efforts to reduce environmental impact and support its customers’ sustainability goals.
Read More →
Can Multi-Speed EV Transmissions Solve Heavy Trucking’s Biggest Electric-Vehicle Problems?
A startup called Sigma Powertrain believes purpose-built multi-speed gearboxes can boost efficiency, reduce battery size and improve gradeability for heavy-duty battery-electric trucks.
Read More →
Hendrickson Debuts Electraax E-Axle for Medium-Duty Trucks
Developed with Driventic, Hendrickson's new integrated e-axle is designed to improve efficiency, reduce weight, and extend range in Class 6-7 EV applications.
Read More →
50 Ways Fleets Can Cut Fuel Costs Now — Without Buying New Trucks
Fuel savings don’t come from one big change. They come from dozens of small ones. Here’s how leading fleets are stacking gains across drivers, routing, maintenance, and more.
Read More →
Top Green Fleets 2026: How Fleets Are Reducing Emissions in the Real World
What works in sustainable trucking today? Heavy Duty Trucking's Top Green Fleets are finding practical ways to cut fuel use, reduce emissions, and keep freight moving.
Read More →
California Launching $1 Billion Electric Truck Rebate Program
CARB says the California Clean Fuel Reward program will begin offering point-of-sale rebates of up to $120,000 for electric commercial trucks starting June 26.
Read More →