US Patent 7314237 Pipe joint assembly

A pipe joint assembly including a transparent quill; an outer quill having at least a first view port, and having at least a first outwardly extending pipe coupling thread which extends longitudinally along and helically about the outer quill, the transparent quill being slidably received by the outer quill; a pair of baffles; and baffle mounting helical threads interconnecting the baffles and the outer quill, the baffle mounting helical threads positioning the baffle so that they extend radially inward from the outer quill, the baffle mounting helical threads further positioning the baffles for resisting longitudinal sliding and counter-sliding motions of the transparent quill.