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Flexible electronic card and method

  • US 5,703,755 A
  • Filed: 05/07/1997
  • Issued: 12/30/1997
  • Est. Priority Date: 04/03/1995
  • Status: Expired due to Fees
First Claim
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1. A flexible electronic card for use with an electronic card reader comprising a flexible substrate formed of plastic and having dimensions of approximately 33/8" by 21/8" such that it can fit into a conventional billfold, a flexible semiconductor device having an area greater than 100 mils by 100 mils carried by the flexible substrate;

  • and being accessible electronically by the electronic card reader characterized in that the;

    card and the semiconductor device carried thereby can withstand bending over a 2" radius without breaking or damaging the semiconductor device, said semiconductor device having edges and having a substantially uniform thickness in the range of 2 to 7 mils and being free of tapered edges, said semiconductor device having a back surface;

    that is ground and polished with peak-to-peak variations of less than 2 microns to provide a semiconductor device with substantially reduced stress.

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