Invalidity dossier
US 5463623
Integrated wireless telecommunication and local area network system
Current assignee: Avaya Inc
Added 9/17/2026, 2:32:45 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 5,463,623 A
Title: Integrated wireless telecommunication and local area network system
Patent number / application: US 5,463,623 A (application US07/738,415)
Inventors: Gary J. Grimes; Thomas M. Quinn
Original assignee: AT&T IPM Corp; the source also lists current assignees Avaya Inc. and AT&T Inc. (as listed, without verification).
Key dates (as listed): Priority/filing 1991-07-31; granted/publication 1995-10-31; anticipated expiration 2012-10-31. Legal status shown: Expired – Lifetime.
Purpose (from the text): Prior wireless telecommunication arrangements suffered from insufficient communication spectrum for the telecommunication equipment in a business site with many private and group offices, and prior LAN and telecommunication systems were separate. Separate systems also required large amounts of cabling that were expensive to install and change and unsightly in offices. The invention addresses these problems by simultaneously providing high-speed wireless LAN capability and wireless ISDN capability within a group or private office.
Plain-language scope (from the text): The apparatus comprises a cell controller in each office, an ISDN interface in each telecommunication unit, and a LAN interface in each LAN unit. These interfaces communicate by time-division multiplexing using a framing technique on a wireless (radio frequency or photonic) medium. Each frame is divided into time slots for ISDN protocol data, with the remainder reserved for LAN protocol data; each ISDN channel uses two time slots (one receive, one transmit). The LAN interfaces use only a portion of each frame for signaling and data transfer under a LAN protocol (e.g., CSMA/CD similar to Ethernet, or token ring). The cell controller interconnects telecommunication units to a telecommunication switching system (PBX or public telephone network) using ISDN protocol, determines which LAN units communicate with that system, and converts between LAN and ISDN protocol data. Reuse of radio frequency or photonic bandwidth is enabled by the small areas each apparatus serves. Figure 1 shows the system; Fig. 2 the cell controller; Fig. 3 a computer or telecommunication unit; Fig. 4 a wireless frame. ISDN termination 101 is described as an ISDN basic rate interface (BRI) linking the cell controller to telecommunication system 130.
Not established by this excerpt: the full claims, dependent-claim scope, embodiments beyond those summarized, other prior-art references, and any further text omitted from the excerpt.
Generated 10/1/2026, 10:03:06 PM
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Litigation summary
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Assignment history
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Prior art
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Derivative works
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