BLACKMUN, Circuit Judge.
On October 16, 1962, United States Patent No. 3,058,668 for an invention entitled "cleaning apparatus" was issued to plaintiffs Oren B. Harmes, John H. Threlkeld and Donald A. Deal as joint inventors. These individual plaintiffs have granted the corporate plaintiff, Britt Tech Corporation, an exclusive license to manufacture, use, and sell devices embodying the subject matter of the patent.
The four plaintiffs sued L & A Products...
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