There is no implied covenant for validity1 when a patent2 is assigned3, but an assignor is estopped from denying validity as against his assignee4. An assignor may, however, exclude liability in respect of his right to assign the patent5.
A covenant to pay a sum out of the profits derived from the use of the invention or by way of royalty runs with the patent and is binding on a legal assignee of the patent with notice of the covenant
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