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I have just come across this information on my late father's patent for an ice-making machine in the 1970's. I am his daughter, and was involved with his business Venturi Refrigeration before his death in 1995. Obviously a lot of time has elapsed since then but it never occurred to me to look up my father's past patents.

I just want to check whether there is anything I should do now about his patents or how can I tell whether any other companies have either applied to use his patent or have used his patent without permission?

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Patents expire and anything issued in the 70's would have expired in the 90's leaving no rights or value. –  George White Jun 4 '14 at 16:17

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