Patent ID: 6926197

Claim:
A disposable biodegradable drinking cup comprising: a frustoconical liner composed of a biodegradable sheet material with an internal lining of a liquid-impervious material, an outer frustoconical shell surrounding said liner and connected therewith at least at a mouth of the cup at a top thereof and at a bottom of the cup, said shell and said liner defining a space between them between the bottom and the top of the cup; a bottom member sealed to said liner at the bottom of said cup and closing an interior thereof; and a biodegradable structure in said space comprised of ridges running peripherally and transverse to an axis of said cup and obstructing flow of air in said space from the bottom to the top, thereby limiting loss of heat from said interior and heating of said interior from an exterior of the cup, said ridges being spaced apart from top to bottom in said space, said ridges being hardened imprints of a viscous, ink forming a printed pattern.