P

Inventor

LADD DAVID J

US10 patents
⚠️ This page may combine multiple inventors who share the name “LADD DAVID J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

OPCOM

3 patents
US4783796ANov 8, 1988

PBX telephone call control system

OPCOM110 citations94
US4747124AMay 24, 1988

PBX telephone call control system

OPCOM104 citations94
US4792967ADec 20, 1988

PBX DID and E and M tie trunk integration adapter and method

OPCOM29 citations85

VMX INC

3 patents
US5517556AMay 14, 1996

Call processing system with facsimile processing

VMX INC81 citations92
US5355406AOct 11, 1994

Integrated application controlled call processing and messaging system

VMX INC104 citations92
US5325422AJun 28, 1994

PBX telephone call control system

VMX INC17 citations81

VMX OPCOM

2 patents
US4926462AMay 15, 1990

Interface to and operation of a voice messaging system

VMX OPCOM162 citations94
US5117451AMay 26, 1992

Interface to and operation of a voice messaging system

VMX OPCOM46 citations88

OCTEL COMMUNICATIONS CORP

1 patent
US6097791AAug 1, 2000

Voice-messaging system with non-user outcalling and auto-provisioning capabilities

OCTEL COMMUNICATIONS CORP82 citations92

LUCENT TECHNOLOGIES INC

1 patent
US5991370ANov 23, 1999

Voice messaging system and method providing message delivery verification

LUCENT TECHNOLOGIES INC14 citations73