Abstract:
The present invention relates to a container, especially for moisture-sensitive goods, with a container body formed by a wall and a bottom of the container, and a container cover which can be opened and closed. The container has a layer, preferably containing a desiccant, which extends over at least a part of the body and a transponder which is arranged between body and layer.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims foreign priority benefits under 35 U.S.C. §119 from European patent application Ser. No. 05 014 386.6 filed Jul. 1, 2005. 
     TECHNICAL FIELD 
     The present invention relates to a container for moisture sensitive goods, and more particularly to a container having a layer, preferably containing a desiccant, which extends over at least a part of the body, and a transponder which is arranged between body and layer. 
     BACKGROUND OF THE INVENTION 
     A container for moisture sensitive goods is known from EP 454 967. This container comprises a container body with a container wall and a container bottom, and a layer arranged internally in the container. In the case of the above container, this layer comprises a desiccant. Such a container is suitable for receiving drugs or other goods which have to be kept dry for a long time. 
     To allow tracking and tracing of the container comprising goods, it has been proposed to attach a radio frequency ID (RFID) transponder to the container. One proposal is to integrate the transponder in the container cover or container lid. However, the cover may be taken off and an inadvertent exchange may take place which prevents a correct identification of the container and its goods in question. 
     Another proposal was to attach a transponder by clips in a hollow bottom space protruding downward from the container. Such a construction prevents the container from being manufactured as usual, and it is not surprising that such a complicated structure has not been a commercial success. Also, the center of gravity of the container rises such that the container gets unstable. The container is not theft-proof as the transponder may be taken away easily, and the transponder itself is not tamper-proof. 
     A transponder is usually made from a RFID chip and an antenna. The antenna extends essentially flat and comprises a coil made from metal or metallized plastic material. The transponder is covered by thin plastic sheets on both of its sides. Due to its flat structure, which may be as thin as 20 μm, it is possible to attach the transponder on surfaces on any suitable containers. An example of such transponders for bottles may be taken from DE 200 10 351 U1. 
     OBJECTS AND SUMMARY OF THE INVENTION 
     It would be desirable to efficiently control the presence and types of drugs and other goods, both for economical and security reasons. 
     Thus, it is an object of the present invention to provide a container for moisture sensitive goods which is easy to manufacture and allows a safer handling. 
     More particularly it is an object of the present invention to provide a container with a layer, preferably containing desiccant, which extends over at least a part of the body, and a transponder which is arranged between the body and the layer. 
     Thus, the inventive container has a transponder including preferably a RFID chip safely received in a space which is adjacent to both the layer and the body of the container. Although the layer may be produced from any suitable material such as a plastic coating material, it advantageously comprises a desiccant. While usually the layer comprising desiccant material is used only from one side i.e. the inner side which extends towards the goods to be received within the container, according to the invention, the transponder is adjacent to its other side which was not used before. Accordingly, the transponder is both kept safe and dry such that inexpensive transponders may be used even without plastic sheets which are usually required for covering the transponders. 
     By arranging the transponder between container body and layer, the transponder is both protected and invisible but yet has a sufficient operability. In this regard, both the layer and the body are essentially made from plastic material which does not form any barrier for electromagnetic waves. The transponder may be made as a flat disc received close to the bottom of the body but it may also be received as a flat and arcuate sample extending between the layer and the body, close to the container wall. Preferably, the container has a generally cylindrical shape but any other shape such as rectangular or any other suitable geometric form may be used for the inventive arrangement. 
     It is preferred to provide the transponder in a flat area. In another preferred embodiment, the transponder antenna extends essentially flat while its RFID chip is received in a small recess which is provided in the body or in the layer. The overall thickness of the antenna may be as little as 10 μm while the chip may be produced in a suitable size which is easy to handle and to manufacture i.e. between 20 and 100 μm thickness. 
     It is preferred that the layer fully covers and seals the transponder against the drugs or other goods. Thus, the drugs do not get contaminated by any transponder material and also the transponder is protected against any substance which might by contained in the goods. On the other hand, the transponder is invisible as a user will not take notice that the overall bottom of the container has a slightly increased thickness, compared to the thickness of the wall of the container. 
     Advantageously, both the layer and the body may be manufactured in a well-known manner i.e. without any need to re-work the machining tools. Simply, the cup-shaped layer is inserted into the cup-shaped container body after the transponder is placed into it. 
     Any suitable information may be transmitted upon activation of the transponder. The RFID chip may be selected in any suitable manner, advantageously comprising a memory device. The information received and transmitted to the scanner may comprise any data regarding the goods received in the container, the production details etc. 
     In an advantageous embodiment, the container comprises a moisture sensor which may be embedded in the layer. This moisture sensor is electrically connected with the transponder such that it allows the transponder to transmit any moisture data. Thus, the customer may easily judge whether or not the humidity in the container is sufficient and an alarm may be given if humidity increases beyond a predetermined level. 
     In another embodiment which is suitable for very small containers, the antenna of the transponder extends separately from the RFID chip. One possibility is to integrate the antenna in the container body such that only the RFID chip of the transponder is received in the space between layer and body. This requires to rework the production of the container body such that this solution is not preferred for normal-sized containers. Yet it allows a tamper-proof arrangement of the RFID chip without leaving the scope of the present invention. 
     Advantageously, an inexpensive transponder may be used. Preferably, all elements of the transponder a fixed on a base sheet and altogether are arranged in a hollow space between the layer and the body. While the operation temperature range with former transponders was limited due to condensation water which occurs at low temperatures and may have a negative impact on the transponder, according to the invention, the desiccant material contained in the layer will prevent the generation of condensation water such that the temperature range of operation is extended. 
     Further details, advantages and features may be taken from the following description of two embodiments of the invention with reference to the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG. 1  is a perspective view of a container according to a first embodiment of the invention, cut into two pieces with the front piece broken away; and 
         FIG. 2  is an enlarged sectional view of the transponder as received in the lower part of a container according to a second embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a container  10  standing upright with the front half being cut away. The container has a cover  12  which may be opened and closed in a well-known manner. A body  14  of the container is essentially cylindrical and cup-shaped. The body  14  comprises a container wall  16  and a container bottom  18 . Cover  12  is pivotally mounted at a hinge  20  on body  14 , and seals at sealing line  22  against the container body  14 . 
     Body  14  is internally covered by a layer  24  made from plastic material. Preferably, this layer contains desiccant, and preferably the layer is made from 2AP (2 absorbant polymers) as it is described in U.S. Pat. No. 5,432,214. Any other polymer composition may be used, and also molecular sieve or zeolite. 
     Layer  24  fully covers the bottom portion  34  and the wall portion  16  of body  14 . It has an essentially equal thickness with the exception of its upper end. There, an oblique portion  26  facilitates insertion of goods like drugs etc. into the container. 
     According to the invention, a transponder  30  is received within a closed space between layer  24  and body  14 . In the present embodiment, the transponder  30  is formed like a disc which covers bottom  18  and is received within a flange  32  which protrudes downward from a bottom portion  34  of layer  24 . The transponder is held under pressure exerted between the layer  24  and the body  14  towards each other. 
     The transponder  30  may be built up in any suitable manner. Usually, a RFID chip is combined with a coil-shaped antenna but any other circuit may be selected which is able to send data about the identification of the container to a suitable receiver. Preferably, the transponder  30  does not comprise a power source but is activated by the electromagnetic energy received via its antenna. On the other hand, it is also possible to use a small battery if desired. Thus, the understanding of transponder is broader than usual here and shall also include a plain transmitter. 
     As may be taken from  FIG. 1 , the container bottom  18  has a receding center portion  36  which centrally improves the stability of the container. The container wall and bottom also have a uniform thickness which is slightly larger than the thickness of layer  24 . In the present embodiment, the thickness of the container body  14  is about 50% larger than the thickness of layer  24  and the thickness of transponder  30  is about double the thickness of layer  24 . 
     Preferably, the inventive container is mounted such that the cup-shaped layer  24  is turned upside down. Then the transponder  30  is inserted into the center portion of flange  32 . Then, body  14  is firmly pushed over the arrangement of transponder  30  and layer  24 . Preferably, there is a snap-fit connection between, and the layer  24  has a press fit within wall  16 . By this, layer  24  cannot be inadvertently taken out, and the container is tamper-proof, all the more as transponder  30  is not visible. In this regard, it is preferred that at least the bottom  18  of container body  14  and the bottom portion  34  of layer  24  are not transparent. 
     A further embodiment of the inventive container is schematically indicated in  FIG. 2  which shows a sectional view of the lower portion of the container  10 . The transponder  30  is received also between layer  24  and body  14  of the container. The transponder  30  comprises a RFID chip  40  and a coil-shaped antenna  42 . The layer  24  has, at its bottom portion  34 , a central recess  44  which is sized to receive chip  40 . The transponder also comprises a plastic sheet  46  for mounting the antenna  40  and the RFID chip  40 . There is no additional cover sheet, and both the chip and the antenna are kept dry by layer  24  which comprises desiccant. Sheet  46  is received on the flat upper surface of bottom  18 . 
     This embodiment shown in  FIG. 2  shows an even thinner construction of transponder  30 . The sheet  46  may have a thickness of 10 μm and the antenna  42  may consist of a metal with a thickness of 15 μm such that the overall thickness—with the exception of the RFID chip—is only 25 μm. The transponder  30  is safely received and kept dry within container  10 . 
     While a preferred form of this invention has been described above and shown in the accompanying drawings, it should be understood that applicant does not intend to be limited to the particular details described above and illustrated in the accompanying drawings, but intends to be limited only to the scope of the invention as defined by the following claims. In this regard, the term “means for” as used in the claims is intended to include not only the designs illustrated in the drawings of this application and the equivalent designs discussed in the text, but it is also intended to cover other equivalents now known to those skilled in the art, or those equivalents which may become known to those skilled in the art in the future.