Humphries’s innovation was the addition of a supplementary layer to the bottom of a carpet to provide an extra cushion and to strengthen the overall structure. The added stuffer weft is a stout, loosely twisted cord, woven into the underside of the carpet and interlaced with the ground warp. These samples of carpeting are important because they are the earliest known examples of patented carpeting in the United States.
Whether this patent was utilized is unknown but there is evidence of Humphries being involved in the manufacture of carpeting. The Journal of the Franklin Institute lists premiums awarded at their eighth exhibition in 1833. John Humphries was presented a premium for four pieces of Brussels carpeting. The judges noted that “these goods are of excellent quality and style, and satisfactory assurances have been received that they are exclusively of American workmanship throughout all the processes from the raw material to the finished product of the loom.”