At least three similar devices which promise to eliminate household standby power waste will hit the shops this summer.
The adapters cut the power to consumer electronics products left on standby, but still enable the devices to be switched on and off using a remote control.
All five Dragons promised to invest in the EcoTech product demonstrated by Ecotech founders Peter Ensinger and David Baker, but only if their patent stood up to close scrutiny. It did not, and the Dragons pulled out.
However, Ensinger claimed that his company has since struck a deal with another investor.
The UK government estimates that leaving household electrical devices on standby results in 800,000 tons of carbon emissions each year, and costs consumers £660m a year in electricity charges.
Ceres, located in the asteroid belt, has a carbonaceous-rich upper crust, SwRI study claims
The spacecraft found traces of hydrogen and oxygen molecules, known as hydroxyls, embedded in the rocky surface of the asteroid
The skeleton was unearthed more than 20 years ago in South Africa
Moon's dark side is mountainous, rugged and never visible from the Earth