US5327018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interface circuit for chip cards
Assignee: Gemplus SA
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Filing: 1992-10-30
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Granted: 1994-07-05
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Expires: 2012-10-30
Abstract
Abstract The invention concerns interface circuits for chip card readers. It consists of providing link connections between this circuit and the reader, these connections being identical to those established between the circuit and the chip card. An internal switch (102) in the circuit is used to link these connections together, or to a control register (101), which is internal to the circuit, and actuated by an additional control connection. With the invention, it is possible to limit the number of connections between the circuit and the reader and to control the circuit with a software interface which is identical to the control interface of a chip card.
Inventors
- 👤 Thierry Karlisch
- 👤 Jacek Kowalski
- 👤 Patrice Peyret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:19
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/0264; H04L25/028; G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4072; H04L25/0292
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
Specialized interface circuit for chip card, comprising a first set of connections to be connected to the card, a second set of connections to be connected to a card reader's data processing system, and a control register for controlling the circuit operation wherein the second set of connections comprises a sub-set of connections which are identical to the first set and a switching control connection, and that the circuit also comprises means of switching enabling either the connections of the sub-set to be linked respectively to the corresponding connections in the first set, or the connections of the sub-set to be linked to the control register, actuated by the control connection.
Claim 2
Dependent Claim
111 words
Specialized interface circuit for chip card, comprising a first set of connections to be connected to the card, a second set of connections to be connected to a card reader's data processing system, and a control register for controlling the circuit operation wherein the second set of connections comprises a sub-set of connections which are identical to the first set and a switching control connection, and that the circuit also comprises means of switching enabling either the connections of the sub-set to be linked respectively to the corresponding connections in the first set, or the connections of the sub-set to be linked to the control register, actuated by the control connection.
Claim 3
Dependent Claim
46 words
Circuit according to claim 1, wherein the control register is organized to be able to be written and/or read via the sub-set connections from the reader's data processing system, with a software interface which is identical to the read/write interface of a synchronous type chip card.
Claim 4
Dependent Claim
40 words
Circuit according to any of claims 1 or 2, wherein the connections of the first set and the connections of the sub-set comprise a clock connection, a reset connection, a read or write configuration connection, and an input-output connection. l
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |