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:
Sep. 13, 1983
Filed:
May. 11, 1982
Kazumi Hirota, Tokyo, JP;
Yotaro Tsutsumi, Yokohama, JP;
Senji Ito, Ayase, JP;
Tadahiko Katsura, Yokohama, JP;
Kikuo Matsuoka, Yokohama, JP;
Ichiro Hori, Yokohama, JP;
Toyo Seikan Kaisha Ltd., Tokyo, JP;
Abstract
Disclosed is an easily openable heat seal lid for sealing a vessel proper by forming a heat-sealed portion between the lid and the vessel proper, which comprises a laminate comprising at least an inner face member composed of a thermoplastic resin and a metal foil, wherein scores defining a portion to be opened are formed on the side inner than the portion to be heat-sealed so that the scores extend to the midway of the thickness direction of the metal foil, and said inner face member comprises at least one heat-sealable thermoplastic resin layer having an adhesion strength of at least 800 g/15 mm to the metal foil, a tear strength lower than 3.0 kg and a tensile modulus of at least 300 kg/cm.sup.2. In this heat seal lid, the resin layer can be broken sharply along the scores and opening can be accomplished very easily.