Inventor
HARGRAVE FRANKLIN
US13 patents
⚠️ This page may combine multiple inventors who share the name “HARGRAVE FRANKLIN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ITT
11 patentsUS4672602AJun 9, 1987
Control and routing system
ITT160 citations98
US4665516AMay 12, 1987
Information transport system employing telephone lines
ITT119 citations95
US4656651AApr 7, 1987
System for providing remote services
ITT42 citations92
US4528424AJul 9, 1985
Multiparty line adapter with privacy feature controlled by reversal of line polarity at a central power source
ITT49 citations92
US4638124AJan 20, 1987
Key telephone system with distributed control
ITT7 citations73
US4601029AJul 15, 1986
Communication switching system
ITT16 citations73
US4654869AMar 31, 1987
Information collecting and forwarding apparatus
ITT17 citations70
US4646342AFeb 24, 1987
Test trunk access controller
ITT13 citations70
US4583215AApr 15, 1986
Telephone line access system for main distribution frame
ITT8 citations70
US4575840AMar 11, 1986
Telephone line access device for main distribution frame
ITT9 citations70
US4602362AJul 22, 1986
Information transport system
ITT4 citations62