Granted Patent
Utility
US 5,784,381 · App. 08/665,093
Stored program controlled PBX accommodating secondary rate tie trunks using primary rate interfaces
Inventor:
Yoshihiro Hori
Patented Case
View Patent ↗
Granted: Jul 21, 1998
Filed: Jun 14, 1996
Inventor
Yoshihiro Hori
Assignee (at issue)
NEC CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.