P

Inventor

HSIAO TUNG-HAI

US6 patents
⚠️ This page may combine multiple inventors who share the name “HSIAO TUNG-HAI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

AT & T CORP

3 patents
US6925161B2Aug 2, 2005

Call hold signaling

AT & T CORP13 citations92
US7248683B2Jul 24, 2007

Call hold signaling

AT & T CORP9 citations73
US7526077B2Apr 28, 2009

Call hold signaling

AT & T CORP2 citations62

AT & T BELL LAB

2 patents
US4972461ANov 20, 1990

Call message delivery system and method

AT & T BELL LAB205 citations96
US4939771AJul 3, 1990

Attendant-controlled call message delivery system and method

AT & T BELL LAB75 citations93

AT & T IP II

1 patent
US7822184B2Oct 26, 2010

Call hold signaling

AT & T IP II1 citations56