The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 1983
Filed:
Dec. 31, 1980
William E Sullivan, Blythewood, SC (US);
Risdon Enterprises, Inc, Columbia, SC (US);
Abstract
A device for holding and dispensing a substance such as a liquid, paste or the like, comprises a layer of substance absorbent but heat-sealable reservoir material, for holding the substance, that has two principal surfaces. A first sheet of heat-sealable cover material is disposed in close proximity to one of the principal surfaces of the layer and a second sheet of heat-sealable cover material is disposed in close proximity to the other of the principal surfaces of the layer. The cover materials are substantially impermeable to the substance, are different from the reservoir material, and have different and higher heat sealing temperatures than the reservoir material. The sheets and the layer are compressed together at a continuous boundary at a temperature above the heat sealing temperature of the reservoir material but below the heat sealing temperature of the cover material. Therefore, the reservoir material is fused at the boundary to prevent lateral absorbtion of the fluid substance therepast and the cover material is lightly joined but not fused to the reservoir material. Therefore, the sheets may be removed from the layer to dispense the product by applying a shear force to at least one of the sheets relative to the layer. A method of making this device is also disclosed.