Assignee
BRASILIA TELECOM
BR8 patents
Top patents by PatentIndex Score
US4680558AJul 14, 1987
Corrugated transition device for use between a continuous and a corrugated circular waveguide with signal in two different frequency bands
BRASILIA TELECOM244 citations94
US4777457AOct 11, 1988
Directional coupler for separation of signals in two frequency bands while preserving their polarization characteristics
BRASILIA TELECOM207 citations93
US5200719AApr 6, 1993
Impedance-matching coupler
BRASILIA TELECOM41 citations85
US5929416AJul 27, 1999
Reading head arrangement for two data card types
BRASILIA TELECOM23 citations82
US5984183ANov 16, 1999
Card reader for two kinds of data cards
BRASILIA TELECOM9 citations65
US5834757ANov 10, 1998
Debiting method for inductive prepayment cards
BRASILIA TELECOM4 citations49
US6044953AApr 4, 2000
Independent device for verifying, validating and codifying inductive cards
BRASILIA TELECOM1 citations40
US6050488AApr 18, 2000
Circuit for driving inductive sensors for reading and debiting prepaid cards
BRASILIA TELECOM1 citations39