US Patent 1,990,343, granted Feb. 5, 1935, describes a process for making artificial food for silkworms to replace mulberry leaves. The food is made from soybean that is soaked, ground, boiled and pressed into a curd, then flavored with squeezed mulberry leaf or bud juice as an appetizing agent. The patent also describes forcing mulberry twigs to bud in a hothouse so juice is available out of season. It has one claim and no drawings.