Herman Lindeman patented a construction for "cycloid pianos" in 1860. These roughly semi-circular squares were manufactured with the sides and interior portions of the wooden frame laminated from long, thick veneers bent and glued up into a single, continuous piece with the required shape and thickness, in order to make the pianos "lighter, smaller and circular at the back and sides." The firm advertised that the cycloid was "the most elegant in shape, the most exquisite in tone, the strongest and most enduring piano manufactured in the world" and made an unsupportable claim in the late 1860s that it was "driving the unsightly square piano out of the market." This patent was credited by piano historians Daniel Spillane and Alfred Dolge to Herman's younger brother Henry, who is not listed on the original or reissued United States patents, but is listed jointly with Herman in the 1865 English patent; both historians also identified Henry as the oldest brother.