Assignee
BRASILIA TELECOM
BR·8 granted patents·530 citations·filing 1984–1998
Top patents by PatentIndex Score
8 records- 0194US4680558ACorrugated transition device for use between a continuous and a corrugated circular waveguide with signal in two different frequency bandsBRASILIA TELECOM·Filed 1984·Granted Jul 14, 1987·244 cites·9 claims
- 0293US4777457ADirectional coupler for separation of signals in two frequency bands while preserving their polarization characteristicsBRASILIA TELECOM·Filed 1987·Granted Oct 11, 1988·207 cites·15 claims
- 0380US5200719AImpedance-matching couplerBRASILIA TELECOM·Filed 1991·Granted Apr 6, 1993·41 cites·9 claims
- 0448US5929416AReading head arrangement for two data card typesBRASILIA TELECOM·Filed 1995·Granted Jul 27, 1999·23 cites·5 claims
- 0533US5984183ACard reader for two kinds of data cardsBRASILIA TELECOM·Filed 1996·Granted Nov 16, 1999·9 cites·5 claims
- 0620US6044953AIndependent device for verifying, validating and codifying inductive cardsBRASILIA TELECOM·Filed 1998·Granted Apr 4, 2000·1 cites·5 claims
- 0719US5834757ADebiting method for inductive prepayment cardsBRASILIA TELECOM·Filed 1995·Granted Nov 10, 1998·4 cites·8 claims
- 0818US6050488ACircuit for driving inductive sensors for reading and debiting prepaid cardsBRASILIA TELECOM·Filed 1995·Granted Apr 18, 2000·1 cites·9 claims
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