P

Inventor

ROBERTSON DAVID J

CA5 patents
⚠️ This page may combine multiple inventors who share the name “ROBERTSON DAVID J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

NORTHERN TELECOM LTD

3 patents
US5027345AJun 25, 1991

Digital key telephone system

NORTHERN TELECOM LTD27 citations89
US4893310AJan 9, 1990

Digital key telephone system

NORTHERN TELECOM LTD25 citations89
US4873682AOct 10, 1989

Digital key telephone system

NORTHERN TELECOM LTD12 citations67

AMPEX

1 patent
US4140896AFeb 20, 1979

Electronic digital tape timer

AMPEX16 citations70

ROLLS ROYCE PLC

1 patent
US12429096B2Sep 30, 2025

Joint assembly and method of manufacturing thereof

ROLLS ROYCE PLC1 citations49