1

In reference to the patent: US 2,981,578

I would like to know if the copy rights of this item are still in their period of validity.

2

Copyright is not applicable, so I am assuming you mean "enforceable".

The patent in question has a Filing Date of May 20, 1959, a grant date of April 25, 1961, and is a continuation from an application with a Priority Date of May 2, 1957.

The patent, and its claims and subject matter have been in the Public Domain since April 25, 1978.

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