Darrell P. Salisbury and Robert L. Sloan, Process for Cleaning Pipe Dope and Other Solids from Well Systems, U.S. Patent ۵٬۶۷۶٬۷۶۳, granted Oct. 14, 1997.
John D. Watts and Beverly W. Ramos, Wedgethread Pipe Connection, U.S. Patent ۶٬۶۸۲٬۱۰۱, granted Jan. 27, 2004; see claim 24.
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