Dual Drinking Cup

Abstract

The invention provides a reversibly-attached and easily-separated set of nested cups. The outer cup can quickly and easily be detached from the inner cup, and the two cups used to share a single drink. When not in use, the outer cup remains securely attached, and provides a degree of insulation for the contents of the inner cup.

I claim: 
     
         1 . A pair of nested drinking cups, suitable for containing beverages, consisting of an inner cup and an outer cup, the inner and outer cups each comprising a sidewall and a bottom portion, wherein the inner cup nests within the outer cup and is fastened to the outer cup by a reversible means of attachment. 
     
     
         2 . A pair of nested drinking cups, suitable for containing beverages, consisting of an inner cup and an outer cup, the inner and outer cups each comprising a sidewall and a bottom portion, wherein the inner cup nests within the outer cup and is fastened to the outer cup by a reversible means of attachment which comprises two or more male threads formed on the outer cup, the threads being engageable with two or more female threads formed on the inner cup. 
     
     
         3 . A pair of nested drinking cups, suitable for containing beverages, consisting of an inner cup and an outer cup, the inner and outer cups each comprising a sidewall and a bottom portion, wherein the inner cup nests within the outer cup and is fastened to the outer cup by a reversible means of attachment which comprises two or more male threads formed on the inner cup, the threads being engageable with two or more female threads formed on the outer cup. 
     
     
         4 . The pair of nested cups according to  claim 2  wherein the reversible means of attachment is formed into the sidewalls of the inner and outer cups. 
     
     
         5 . The pair of nested cups according to  claim 3  wherein the reversible means of attachment is formed into the sidewalls of the inner and outer cups. 
     
     
         6 . The pair of nested cups according to  claim 2 , wherein the reversible means of attachment comprises one or more male threads formed on a projection in the bottom portion of the outer cup, the threads being engageable with one or more female threads formed on a recess in the bottom portion of the inner cup. 
     
     
         7 . The pair of nested cups according to  claim 3 , wherein the reversible means of attachment comprises one or more female threads formed on a projection in the bottom portion of the outer cup, the threads being engageable with one or more male threads formed on a recess in the bottom portion of the inner cup. 
     
     
         8 . The pair of nested cups according to  claim 4 , wherein the length of the male threads subtends an angle of less than 180 degrees. 
     
     
         9 . The pair of nested cups according to  claim 5 , wherein the length of the male threads subtends an angle of less than 180 degrees. 
     
     
         10 . The pair of nested cups according to  claim 8 , wherein the length of the male threads subtends an angle of less than 90 degrees. 
     
     
         11 . The pair of nested cups according to  claim 9 , wherein the length of the male threads subtends an angle of less than 90 degrees. 
     
     
         12 . The pair of nested cups according to  claim 10 , wherein the length of the male threads subtends an angle of less than 45 degrees. 
     
     
         13 . The pair of nested cups according to  claim 11 , wherein the length of the male threads subtends an angle of less than 45 degrees.