Disposable liner system for cup

Abstract

A shaker cup with a main cup body, a disposable cup liner, a disposable mixing grid, a disposable lid member and a lid retaining ring. The disposable cup liner is inserted into the main cup body and has flange that fits over the top of the main cup body lip. The disposable mixing grid fits within the top area of the main cup body. The disposable lid member has a flange that matches the diameter of the disposable liner flange. The lid retaining ring capable screws onto the main cup body, and in the process, capturing the inner liner flange, the mixing grid flange and the lid member flange to hold them in a liquid retaining manner. A preferred embodiment includes the disposable cup liner, the disposable mixing grid, the disposable lid member and the disposable spout cap member are all made of biodegradable molded plastic.

What is claimed as invention is: 
     
         1 . A shaker cup comprising:
 a main cup body made of rigid material and having an external threaded portion molded into its upper wall surface ;   a disposable cup liner;   a disposable mixing grid;   a disposable lid member including a drinking spout portion ;   a disposable spout cap member;   a lid retaining ring having a threaded portion molded into its inner wall surface;   said disposable cup liner capable of insertion into said main cup body where the outside wall of said liner maintains close proximity to the inside wall of said main cup body;   said disposable cup liner having an outwardly disposed flange at its upper most perimeter that fits over the top of said main cup body lip;   said disposable mixing grid capable of fitting within the top area of said main cup body and said disposable liner and having a flange that matches the said flange of said disposable liner;   said disposable lid member having a flange that matches the diameter of said disposable liner flange;   said lid retaining ring capable of being screwed onto said main cup body, and in the process, capturing said inner liner flange, said mixing grid flange and said lid member flange and holding them in a liquid retaining manner; and   said disposable spout cap member capable of removably engaging said lid spout in a liquid retaining fashion.   
     
     
         2 . The shaker cup of  claim 1 , wherein said disposable cup liner, said disposable mixing grid, said disposable lid member, and said disposable spout cap member are all made of biodegradable molded plastic. 
     
     
         3 . The shaker cup of  claim 2 , wherein said biodegradable plastic is polyethylene and includes an additive that makes it biodegradable. 
     
     
         4 . The shaker cup of  claim 3 , wherein said cup liner is made of low density polyethylene and said mixing grid and said lid are molded of high density polyethylene. 
     
     
         5 . The shaker cup of  claim 1 , wherein said mixing grid includes a plurality of apertures capable of breaking up clumps of powdered material suspended in a liquid when said shaker cup is shaken by a user.