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:
May. 10, 1988
Filed:
Nov. 05, 1985
Mark D Shaw, Ponte Vedra Beach, FL (US);
Bondico, Inc., Jacksonville, FL (US);
Abstract
A method of heat sealing a thermoplastic lid to a thermoplastic drum and an article of manufacture comprising a sealed container especially for hazardous and nuclear wastes are disclosed. A pair of flat ribbon resistance wires are encapsulated within a thermoplastic sheath and are arranged in spaced, parallel, substantially coplanar relation. For welding together the drum and lid, one or more pairs of encapsulated wires are attached to the lid and are compressed between confronting surfaces of the lid and drum by mean of a drum clamp. A predetermined electric current is passed through the wires to heat the wires and melt the thermoplastic sheath. As the thermoplastic sheath melts, the pressure exerted by the drum clamp squeezes the molten thermoplastic material radially inwardly and outwardly along the confronting surfaces of the lid and drum. The heated wires are urged into contact with the thermoplastic material of the drum and lid which is melted and intermingled to thereby weld the lid and drum together and form a sealed container.