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. 29, 1990
Filed:
Jun. 13, 1989
Andrea Romagnoli, San Lazzaro di Savena, IT;
Cestind - Centro Studi Industriali-S.R.L., San Pietro Terme, IT;
Abstract
A sealing device with multiple differential action is provided for machines producing dual-use filter sachets for infusion products. In such machines a continuously moving strip of thermally weldable filter paper, fed with equidistantly spaced fractional doses of the infusion product, is progressively folded longitudinally into a flattened tubular shape with adjacent folded-back longitudinal edges forming a longitudinal crest. The device is constituted by two blocks having respective pairs of mirror-image stepped overlapping edges extending to the opposite sides of the adjacent folded back edges of the strip forming the longitudinal crest. The mirror-image edges of the upper overlap have bores connected to a fluid-dynamic heat source. The mirror-image edges of the lower step have a lamellar structure.