Inventor

MCDONALD HENRY S

US3 patents

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

AMERICAN TELEPHONE & TELEGRAPH

1 patent

US4672604AJun 9, 1987

Time slot polling arrangement for multiple stage time division switch

AMERICAN TELEPHONE & TELEGRAPH18 citations68

AT & T INFORMATION SYSTEMS INC

1 patent

US4633461ADec 30, 1986

Switching control for multiple stage time division switch

AT & T INFORMATION SYSTEMS INC10 citations68

BELL TELEPHONE LABOR INC

1 patent

US4320258AMar 16, 1982

Arrangement for requesting service for called telephone subscribers

BELL TELEPHONE LABOR INC14 citations68