US Patent 4,008,643, "Knotless Tatting," granted to Dora M. Young of Kittery, Maine, on February 22, 1977 (filed November 24, 1975). It describes a tatting method that reduces the number of knots, using reversed double stitches along a single thread with a hooked shuttle. Instructions cover picots, rings, joining rings, ring-and-chain edgings, knotless rings and chains, tatting on a hemstitched edge, and solid work. The scan includes a USPTO web printout, the patent text and four sheets of line drawings showing hand and shuttle positions and finished lace pieces, with two numbered claims.