.~.~ With substantial, firm, top insulator or reinforcing grid on spring core
DEFINITION
Classification: 5/721
With substantial, firm, top insulator or reinforcing grid on spring core:
(under subclass 716) Innerspring-type core mattress including (a) a relatively hard separator between the coiled wire member core and the pad ticking to prevent the coiled wire members within the core from penetrating the surface or (b) including a hard element such as a wire grid or rigid board to provide reinforcement for at least a portion of the top supporting surface spaced from the periphery of the pad.
