US Patent 3,794,499 (granted Feb. 26, 1974) describes an artificial feed for domestic silkworms (Bombyx mori) that combines a conventional mulberry-leaf-powder feed with at least 30% unicellular green alga such as Chlorella or Scenedesmus. The patent covers the background on sericulture and artificial diets, example feed compositions, and a rearing-trial table (chlorella content 0-90%) showing faster growth, a shorter larval period, more uniform pupation, and heavier cocoons at 30% or more. It ends with two claims and the references cited.

US Patent 3,792,172 (granted Feb. 12, 1974) describes an artificial feed for rearing wild silkworms indoors, such as Chinese tusser, Japanese tusser and eri silkworms. The feed adds unicellular green algae (chlorella or scenedesmus) to conventional feeds of oak, castor bean or tree-of-heaven leaf powder, soybean, sugar, starch and vitamin C. Two examples with comparison tables show shorter larval period, higher survival and cocoon yield, and heavier cocoon shells than the prior-art feed. The patent includes the claim, cited references and background on wild silk.