ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,532,973, issued on Jan. 27.
"Portable spring mattress" was invented by Frank Zingarelli (Newport, R.I.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A portable spring mattress including a mattress assembly and a spring assembly. The mattress assembly includes a top layer and a bottom layer made of a pliable comfortable foam that is configured to support and absorb the weight of a user. Spring assembly includes a plurality of collapsible members and a plurality of torsion spring hinges, wherein the plurality of collapsible members is attached between the top layer and the bottom layer. The plurality of collapsible members include a plurality of torsion ...