Method for making a radio frequency identification device

• US 6,608,561 B2
• Filed: 12/11/2000
• Issued: 08/19/2003
• Est. Priority Date: 05/19/1998
• Status: Expired due to Term

• Current Assignee: Meat Processing Service Corporation
• Original Assignee: Meat Processing Service Corporation
• Inventors: Lawler, Casimir E. Jr., Parry, Richard I.
• Primary Examiner(s): Lee, Benjamin C.
• Application Number:
  US09/734,350
• Publication Number:
  US 20020031997A1
• Time in Patent Office: 981 Days
• Field of Search: 340/572.7, 340/572.8, 340/572.9, 340/693.5, 361/600, 361/752, 361/807, 342/51, 342/42, 298/25, 296/00, 296/01, 295/93, 235/487, 235/488, 235/494, 235/492, 235/493, 452/173, 156/60, 174/52.2, 257/678, 257/687, 257/787, 257/688, 257/679, 257/788
• US Class Current: 340/572.8
• CPC Class Codes: A22B 5/0064 for classifying or grading carcasses; for measuring back fat
• CPC Class Codes: A22B 7/007 Means containing information relative to the carcass that can be attached to or are embedded in the conveying means
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object

Abstract

A radio frequency identification device (RFID) including radio frequency identification circuitry enclosed in a protective molded casing having an attachment surface for attaching the RFID to a ferrous object, the radio frequency identification circuitry being positioned in the casing so as to keep the circuitry a predetermined distance away from the ferrous object which may interfere with the communication between the RFID and the RFID reader.

Claims

1. A method for making a radio frequency identification device (REID) comprising the steps of:

providing radio frequency identification circuitry;

pouring curable liquid into a preformed mold to a first predetermined depth;

allowing a predetermined time to pass to permit the curable liquid to gel, but not sufficient to allow the liquid to fully cure;

placing the circuitry upon the surface of the now gelled liquid;

filling the mold to a second predetermined depth with additional curable liquid;

allowing a second predetermined amount of time to pass to allow both the first and second depths of the poured curable liquid to fully cure and attain a homogeneous interface between the two depths, thereby preventing the occurrence of a seam between the two depths of now cured liquid,

whereby the radio frequency identification circuitry is positioned within the cured liquid so as to keep the circuitry a predetermined distance away from a ferrous object which may interfere with the communication between the REID and an REID reader.

2. A method for making the RFID of claim 1 wherein the first predetermined depth is at least ⅛

of an inch.

3. A method for making the RFID of claim 1 wherein the second predetermined depth is at least ¼

of an inch.

4. A method for making the RFID of claim 1 wherein the curable liquid is a polyurea elastomer compound.

5. A method for making the RFID of claim 1 wherein the preformed mold is designed and constructed to have two projections which span the depth of the mold and are positioned in such a manner to allow placement of the circuitry at least ¼

of an inch away from both of the projections.

6. The preformed mold of claim 5 wherein the projections are further characterized by having a cross-sectional diameter of no less than ⅛

of an inch.

7. A method for making the RFID of claim 1 wherein the preformed mold is designed and constructed to have rounded edges where the walls of the preformed mold intersect.