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US 5,326,019 AGranted
Double walled paper cup
OwnerSteven K. Wolffinventor
Life of this patent
Estimating the term…
Abstract
The invention is a paper cup of double walled construction with an air pocket between the walls. The cup may find use in keeping warm beverages warm and/or cold beverages cold for reasonable periods of time. In the preferred embodiment, a spiral band of paper is in connection with both the inner wall and the outer wall. This member keeps the walls apart to create the air pocket and provides structural rigidity. The cup may be made of relatively narrow width with a small air space between the inner and outer walls.
Claims5
A beverage receptacle comprising:
- an inner wall of cylindrical construction and having a fixed radius and having an outer surface and an inner surface, a spacer in connection with said outer surface, said spacer disposed upon said outer surface in a spiral configuration with radius corresponding to that of said inner wall, an outer wall of cylindrical construction and of larger diameter than said inner wall, said outerwall in connection with said spacer so as to form an air space between said inner and outer walls.
Dependencies are inferred from the claim text.