Andrew Cubitt wrote to the INQUIRER after reading an article about the MSN iLoo, and said Microsoft's idea, which he designed and made two years ago, "sounds remarkably similar" to his own.
Cubitt said that his design has been displayed at several shows, its most recent appearance being at the Ideal Home Show, which ended at the beginning of April.
He said: "It now seems that the clever people at Microsoft have cottoned onto the idea and even call it the i-loo, the same as mine!"
He said: "I have also read an article in a national newspaper and the quote their spokesperson gave even resembled the quotes that I made on the TV and radio a month earlier".
And, he continued, "It seems another example of Microsoft monopolisation squashing out the little people and again copying other peoples ideas".
Microsoft could not be contacted at press time for comment. µ