DE4100693A1
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Contactless transceiver for portable data I=O device - has EM for data transfer between integrated circuit card and read-write device
Assignee: Maxell Ltd
•
Filing: 1991-01-11
•
Granted: —
•
Expires: 2011-01-11
Abstract
Abstract Two transceivers are contactlessly coupled together via an e.m. coupling circuit (11). The first device has a constant amplitude oscillator connected to the coupling circuit and a received signal detector (8). The second device has a waveform shaper (14) for signals received from the coupling circuit and a circuit (15) whose load impedance varies with an applied signal's level, enabling detection of the signal. USE/ADVANTAGE - For IC card reader. Reduced number of channels and simple circuitry.
Inventors
- 👤 Yosuke Katayama
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-05 02:53
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10009; G06K7/10316; G06K7/10346; G01; G01S; G01S13/00; G01S13/74; G06K7/0008
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.