“Case for infringing a patent for ‘a new and useful improvement of a spinning frame for spinning cotton,’ invented by Paul Moody, and assigned by him to the plaintiffs. The patent was dated the 17th of January, 1818, and the assignment the 14th of January, 1819.

“This was a bill in equity, brought by William West, of Southridge, in the state of Massachusetts, one of the children and heirs of William West, formerly of Scituate, in the state of Rhode-Island, against Job Randall, a son-in-law of the last mentioned William West, and Jeremiah Phillips, both inhabitants of said Scituate.

Under the patent act of 21 Feb. 1793, ch. 11, if the patentee has sold out a moiety of his patent right, a joint action lies, by himself and his assignee, for