The company's device has attracted plenty of interest from bread manufacturers - but it is worried that it could push up costs in an industry where margins are very tight.

And there is also a concern that consumers might not take to bread that lasts for so long. Mr Stull acknowledges it might be difficult to convince some people of the benefits.

"We'll have to get some consumer acceptance of that," he said. "Most people do it by feel and if you still have that quality feel they probably will accept it. "

Mr Stull believes that the technology could impact bread in other ways. He said that bread manufacturers added lots of preservatives to try and fight mould, but then must add extra chemicals to mask the taste of the preservatives. If bakers were able to use the microwave technology, they would be able to avoid these additives.

While a wholesale change in the bread industry might be difficult to achieve, there may be more potential with other foods, including ground turkey.

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