Inventor
SPARBER RICHARD G
US7 patents
⚠️ This page may combine multiple inventors who share the name “SPARBER RICHARD G”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
BELL TELEPHONE LABOR INC
5 patentsUS4379210AApr 5, 1983
Ringing detector for use by the deaf
BELL TELEPHONE LABOR INC19 citations80
US4283675AAug 11, 1981
Impedance/admittance measuring circuit
BELL TELEPHONE LABOR INC19 citations80
US4331913AMay 25, 1982
Precision negative impedance circuit with calibration
BELL TELEPHONE LABOR INC7 citations72
US4197429AApr 8, 1980
Gain-adjusting conference circuit
BELL TELEPHONE LABOR INC8 citations72
US4224483ASep 23, 1980
Electronic loaded/nonloaded telephone loop identification circuit
BELL TELEPHONE LABOR INC18 citations66