Invalidity dossier
US 5483524
Method for transmitting data packets via a circuit-switched channel
Current assignee: Motorola Solutions Inc
Added 9/23/2026, 6:53:20 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 5,483,524
Title: Method for transmitting data packets via a circuit-switched channel
Patent number / application: US 5,483,524 A; Application US08/239,489
Inventors: Valy Lev, Rod Averbuch, Israel A. Cimet
Original assignee: Motorola, Inc. (current assignee listed as [Motorola Solutions Inc.](/litigations/by-defendant/Motorola%20Solutions%20Inc.))
Filing / priority date: 1994-05-09
Publication (grant) date: 1996-01-09
Status: Expired – Fee Related; anticipated expiration 2014-05-09
Classifications: H04L12/64 (hybrid switching), H04L12/6418 (hybrid transport), H04W76/10 (connection setup), H04W8/26 (addressing for mobility)
Purpose. The text describes a need to send packet-switched data efficiently over circuit-switched, particularly wireless, channels. It notes the bandwidth disparity between LAN/WANs and wireless systems (sometimes 10×), different resulting protocols, and drawbacks of both pure circuit-switched transmission (channel inactivity between bursts of data) and packet-switched transmission (overhead, scheduling delay), as well as the inefficiency of establishing a circuit-switched connection per packet or packet group.
Plain-language scope. Data to be sent is formatted into data packets, each carrying a first target destination identifier (e.g., an IP address). From that identifier a second target destination identifier is determined. A circuit-switched channel is set up to the target destination using the second identifier, and the packets are transmitted over that channel without transmitting either identifier with them. Packets may be grouped into a session whose header and conclusion indicator control channel set-up and tear-down. A network interfacer (e.g., a gateway) links a LAN/WAN (ISDN, Frame Relay, ATM) to an RF system having a controller with a database, base stations, and a target destination such as a GSM unit or MIRS dispatch radio with a data terminal. The text mentions TCP/IP in simplex operation and AppleTalk Transaction protocol in duplex as examples.
Source: https://patents.google.com/patent/US5483524/en
What the excerpt does not establish: It is excerpted (description text is truncated mid-sentence), so the full logic of FIGS. 4–5 and the complete claims are not shown. It establishes no litigation, ownership-transfer, validity, or prior-art conclusions; legal status entries are described in the source itself as assumptions, not legal conclusions.
Generated 10/1/2026, 9:42:28 PM
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Assignment history
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Prior art
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Derivative works
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