Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Reexamination Certificate
2007-05-01
2007-05-01
Watkins, III, William P. (Department: 1772)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
C428S198000, C428S043000, C428S040100, C383S017000, C604S403000, C604S408000
Reexamination Certificate
active
10783414
ABSTRACT:
The zone of weakening, which is designed as a slot (6a), is bordered by film material (7) on both sides according to length, i.e., across the direction of loading, which is indicated by the arrows F. Tearing (8) which progresses from the edge because of microscopic damage comes to a standstill at the slot (6a) at the latest, because stress peaks are dissipated here and the locally increased stresses are diverted into elements of the film material (7) which are under less stress. Other embodiments include a locally interrupted adhesive layer for separation of an upper film layer from a lower film layer, these two film layers being otherwise glued together. The adhesive-free recesses here constitute zones of weakening in the sense of the present invention. This therefore prevents tears from spreading from one film layer to the next. Furthermore, the propagation of tearing is counteracted due to the dissipation of stresses when a tear that forms in the film layer reaches the zone of weakening.
REFERENCES:
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patent: 2002/0056514 (2002-05-01), Grosskopf et al.
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Collard & Roe P.C.
Schreiner Group GmbH & Co. KG
Watkins III William P.
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