Device with current carrying conductor to produce time-varying magnetic field
An electronic transaction card communicates with an add-on slot of an intelligent electronic device. The add-on slot may be a memory card slot. The intelligent electronic device may be a mobile phone or other device with or without network connectivity. The electronic transaction card may have magnetic field producing circuitry compatible with magnetic card readers, smartcard circuitry, other point-of-sale interfaces, or any combination thereof.
1. A device comprising:
a cellular telephone;
a memory to hold a transaction number;
a battery; and
a conductor capable of producing a time-varying magnetic field that emulates a swipe of a magnetic card, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card.
2. The device of claim 1 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
3. A device comprising:
a cellular telephone;
a memory to hold a transaction number;
a battery; and
a conductor that when excited by a reversing polarity current produces a time-varying magnetic field that emulates a swipe of a magnetic card, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card.
4. The device of claim 3 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
5. A device comprising:
a cellular telephone;
a memory to hold a transaction number;
a battery; and
a conductor that when excited by a reversing polarity current that varies in amplitude produces a time-varying magnetic field that emulates a swipe of a magnetic card, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card.
6. The device of claim 5 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
7. A device comprising:
a cellular telephone;
a battery;
a memory to hold a transaction number;
a conductor capable of producing a time-varying magnetic field that emulates a swipe of a magnetic card, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card; and
a current driver to allow control of the time-varying magnetic field.
8. The device of claim 7 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
9. A device comprising:
a cellular telephone;
a battery;
a memory to hold a transaction number;
a conductor that when excited by a reversing polarity current produces a time-varying magnetic field that emulates a swipe of a magnetic card, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card; and
a current driver to allow control of the time-varying magnetic field.
10. The device of claim 9 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
11. A device comprising:
a cellular telephone;
a battery;
a memory to hold a transaction number;
a conductor that when excited by a reversing polarity current that varies in amplitude produces a time-varying magnetic field that emulates a swipe of a magnetic card, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card; and
a current driver to allow control of the time-varying magnetic field.
12. The device of claim 11 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
13. A device comprising:
a cellular telephone;
a memory to hold a transaction number;
a wire capable of producing a time-varying magnetic field that emulates a swipe of a magnetic card when excited by a current, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card; and
a current driver to allow control of the time-varying magnetic field.
14. The device of claim 13 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
15. A device comprising:
a cellular telephone;
a memory to hold a transaction number;
a wire capable of producing a time-varying magnetic field that emulates a swipe of a magnetic card when excited by a reversing polarity current, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card; and
a current driver to allow control of the time-varying magnetic field.
16. The device of claim 15 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.
17. A device comprising:
a cellular telephone;
a memory to hold a transaction number;
a wire capable of producing a time-varying magnetic field that emulates a swipe of a magnetic card when excited by a reversing polarity current that varies in amplitude, wherein the time-varying magnetic field represents the transaction number and the transaction number is used repeatedly for each emission of the time-varying magnetic field to emulate the swipe of the magnetic card; and
a current driver to allow control of the time-varying magnetic field.
18. The device of claim 17 wherein the time-varying magnetic field emulates a swipe of a magnetic credit card.