Processing the check is IRS's responsibility. If they accepted your check, but do not process it, it is their fault. Once they accept your check, your end of the deal has ended. A while back, I got a notice that I did not pay my state tax.
1 The xiphoid process (Latin: processes xiphoideus) is a small triangular cartilaginous extension of the breastbone.
caudate process the right of the two processes on the caudate lobe of the liver. ciliary p's meridionally arranged ridges or folds projecting from the crown of the ciliary body. clinoid process any of three processes of the sphenoid bone (anterior, medial, and posterior).tyloid process. 1. a pen-like process, as found at the distal end of the radius and the ulna, or of the auricular cartilage. 2. a small blunt cartilaginous process at the base of the petrous temporal bone.