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:
Apr. 17, 1984
Filed:
Jun. 24, 1981
Romano Balordi, Millers, MD (US);
Maryland Cup Corporation, Owings Mills, MD (US);
Abstract
An induction furnace utilizes a channel-shaped induction coil disposed along a mandrel movement line within a cup-making machine to produce eddy currents within a conductive grid arranged intermediate between the induction coil and the mandrel movement line and also within the mandrels themselves. Cylindrical thermoplastic sheet blanks are mounted on the mandrels, and as a result of the heat generated by the eddy currents within the conductive grid and mandrel itself, shrink about the mandrel to produce a finished container conforming to the surfaces of the mandrel. The induction coil is driven by a high frequency alternating current power supply and may be controlled by the placement of a thermocouple within the furnace. By varying the permeability of the inductive grid and the forming mandrel, the mandrel temperature may be controlled separately from the temperature applied to the exterior surface of the cylindrical blanks of thermoplastic material by the conductive grid.