Flexible bags – Tamper indicating
Reexamination Certificate
1998-06-04
2001-07-10
Garbe, Stephen P. (Department: 3727)
Flexible bags
Tamper indicating
C383S061100, C383S063000, C383S064000
Reexamination Certificate
active
06257763
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to reclosable plastic bags with slider zippers and tamper evidence.
DESCRIPTION OF THE PRIOR ART
Various inventions have been made in the area of reclosable plastic bags with slider zippers. For example the Herrington U.S. Pat. No. 5,007,143 shows a zipper profile which is opened and closed by a slider that is grasped by the user for opening and closing the bag. It is desirable in certain situations to provide tamper evidence to the user of a reclosable bag. The Hustad et al. U.S. Pat. No. 5,456,928 is an example of a patent disclosing a reclosable bag for use with food products which has tamper evident means incorporated therein. There are certain situations, for example, where a slider zipper reclosable bag is used to contain a product that is being marketed and it is also desirable to provide tamper evidence.
SUMMARY OF THE INVENTION
One embodiment of the invention might include a plastic film bag having a pair of side walls which are secured to one another and define a mouth of the bag. There is provided a reclosable fastener extending along the mouth of the bag and secured to the side walls. The fastener includes a pair of flexible fastening strips secured to the side walls and including reclosable interlocking rib and groove profile elements on the respective strips. A slider straddles the fastener for opening and closing the fastener. The slider includes a depending separator extending between the flexible plastic strips. There is also provided a sheet of plastic film closing the mouth of the bag which sheet is capable of rupture to provide access and tamper evidence.
In an alternative embodiment, each of the pair of side walls of the plastic film bag has an upper region that forms a sheet of plastic film disposed between the side walls for closing the mouth of the bag.
In yet another embodiment, one of the pair of side walls of the plastic film bag is secured to the inner face of one of the pair of flexible plastic strips and the other of the pair of side walls is secured to the inner face of the other of the pair of flexible plastic strips. The sheet preferably forms at least one curved region. The sheet allows the flexible plastic strips to separate from each other a greater distance when the rib and groove profile elements are in a non-interlocked configuration. In another embodiment, one of the pair of side walls is secured to an outer face of one of the pair of flexible plastic strips and the other of the pair of side walls is secured to an outer face of the other of the pair of flexible plastic strips.
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Burke James W.
O'Connor Thomas P.
Stolmeier Robert C.
Thieman Ronald G.
Garbe Stephen P.
Huntsman KCL Corporation
Woodard Emhardt Naughton Moriarty & McNett
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