Three Decades, 440 Patent Records, One IoT Pioneer: What Digi International’s Patent Portfolio Really Reveals
A data-driven patent landscape and IP portfolio analysis tracing Digi International from serial connectivity to cloud-managed IoT innovation.
Executive Summary: Digi International Patent Portfolio at a Glance
This patent landscape analysis examines 440 patent records, grouped into 194 patent families, linked to Digi International and related assignees such as Ventus Wireless and Teraoka Seiko. Priority dates run from 1990 to 2024, and 721 publications span 15 jurisdiction codes, led by the United States, Europe and WIPO. The intellectual property portfolio is anchored in packet-network protocols (H04L), computing interfaces (G06F) and wireless communication (H04W), reflecting the evolution from serial connectivity to cellular IoT. Legal status analytics show 196 alive records, comprising 185 granted and 11 pending, against 244 dead records, while 295 records have attracted 6,418 citing patents. These patent portfolio insights help IP managers, R&D leaders and investors benchmark innovation strength and identify white-space opportunities.
Digi International Patent Filing Trends: Priority, Application and Publication Dates
Patent Filing Trends Reveal Digi’s Innovation Cycles
Priority activity began in 1990, peaked at 41 records in 2013 and 36 in 2002, then thinned after 2017, with 12 priorities in 2020 and a single one in 2024. Cumulatively, 200 records carry priorities up to 2005, 129 fall between 2006 and 2012, and 111 arrive from 2013 onward. Application dates follow a similar curve, with 29 filings in 2001 and 28 in 2005, then a plateau of 20 to 26 a year across 2010–2015. Publication events peaked at 58 in 2014, and 229 of 721 publications fall within 2013–2017, signalling a mature international pipeline.
Top CPC Patent Classes in Digi International’s IP Portfolio
CPC Classification Shows a Network-First Patent Portfolio
Cooperative Patent Classification (CPC) mapping places H04L, digital information transmission, first with 110 of 440 records, ahead of G06F (71), H04W (51) and H01Q (26). These four classes cover 58.6 percent of all records. At group level, H04L 63 network security leads with 33 records, followed by H04L 67 network services and G06F 13 bus interconnection with 29 each. This concentration signals deep, defensible coverage in secure device networking, while smaller clusters in positioning (G01S) and access control (G07C) mark niche innovation pockets.
IPC Main Group Distribution in Digi International’s Patent Landscape
IPC Analysis Highlights Packet Networking and Computing Depth
International Patent Classification (IPC) tells a slightly different story. H04L 29, covering packet-network protocols, leads with 37 records, followed by G06F 13 (35), G06F 15 (24) and G06F 9 (23). Five of the ten largest main groups sit in G06F, and the G06F subclass totals 136 records versus 86 for H04L, so many Digi inventions are classified primarily as computing and interface technology. Routing (H04L 45, 14 records) and antenna details (H01Q 1, 13) also feature. Reading CPC and IPC together strengthens prior-art searches and freedom-to-operate reviews.
Patent Publications by Country and Jurisdiction Code
Global Patent Jurisdiction Coverage: Where Digi Protects Its Inventions
Of 721 publications, the United States accounts for 381 (52.8 percent), followed by European Patent Office filings with 118 (16.4 percent) and WIPO international applications with 82 (11.4 percent). Together, US, EP and WO represent 80.6 percent of publications, a PCT-driven strategy that preserves optionality across markets. Asia-Pacific coverage is selective: Japan holds 34 publications, Australia 27, China 12 and Korea 7, with Germany (19) and Canada (16) following. India has only 4 publications, which may indicate under-protected markets in fast-growing IoT manufacturing hubs.
Legal Status Distribution of Digi International Patents
Patent Legal Status Analysis: How Much of the Portfolio Is Enforceable?
Granted patents lead with 185 records (42.0 percent), followed by lapsed (155, 35.2 percent), expired (80, 18.2 percent), pending (11, 2.5 percent) and revoked (9, 2.0 percent). In total, 196 records (44.5 percent) remain alive while 244 (55.5 percent) are dead. Cohort analysis is revealing: all 57 records with 1990s priority dates are dead, whereas the 2010–2014 priority cohort retains 87 alive records against 32 dead. The live estate sits mainly in 2005–2014 priorities (130 of 196 alive records), while only 11 applications are pending.
Patent Family Size Distribution Across the Digi Portfolio
Patent Family Size and Global Filing Strategy Explained
The 440 records collapse into 194 unique patent families averaging 3.7 members, with a median of 2. Forty-four families (22.7 percent) are singletons and 65 hold two members, so 109 families (56.2 percent) were filed narrowly. At the other end, 11 families (5.7 percent) contain 13 to 21 members, signalling high-value inventions pursued across many jurisdictions. The two largest families, with 21 members each, belong to Ventus Wireless (priority 2017) and Teraoka Seiko (priority 2020), highlighting broader geographic protection for recent routing, power and retail-system inventions.
Technology Domain Map of Digi International’s Patent Portfolio
Technology Overview: Mapping Digi’s Core Innovation Domains
Grouping CPC subclasses into technology domains puts network protocols and security at the core with 110 records, wireless communication next with 87 (H04W, H04B, H04Q, H04M), and computing interfaces with 71. Secondary clusters include sensing and positioning (30), business, access and retail systems (28), antennas and radio-frequency design (26), and hardware, power and connectors (25). Each domain supports device connectivity and edge intelligence, evidencing a diversified, platform-style IP base rather than a single-product patent estate.
Recent Patent Spotlight: Four Unique Digi Innovations
Four recent publications with distinct technology themes, described through patent classification.
Wireless IoT Communication Services
CPC H04W 4/35Priority 12 Jan 2024Published 17 Jul 2025Family size 1Newest Digi-assigned filing in the dataset, classified under wireless communication services and extending the company’s wireless IoT thread.
Packet Switching and Clock Distribution
CPC H04L 49/405IPC G06F 1/04Priority 15 Mar 2017Published 26 May 2026Family size 21A recently granted member of a 21-publication family, classified for switching hardware construction and clock signal distribution.
Network Routing and Power Supply
CPC H04L 45/60IPC H04L 12/10Priority 15 Mar 2017Published 12 Aug 2026Family size 21European grant covering router architecture and current-supply arrangements, widening protection for networking equipment in Europe.
Retail Point-of-Sale Systems
IPC G07G 1/00Priority 10 Jan 2020Published 2 Sep 2026Family size 21Japanese grant from the Teraoka Seiko partnership, classified in point-of-sale systems, opening a retail and weighing-solutions direction.
Innovation Trajectory: From Serial Connectivity to Intelligent IoT Platforms
Digi International’s innovation trajectory unfolds in three waves. The foundation wave (priorities 1990–2005, 200 records) built secure device networking, and its influence endures: US6446192B1 has drawn 512 citing patents and US7152111B2 has drawn 253, even though both have expired. The expansion wave (2006–2012, 129 records) broadened into wireless, antennas, sensing and hardware. The platform wave (2013 onward, 111 records) shifted toward routing, power and partner-led innovation through Ventus Wireless and Teraoka Seiko, producing 21-member families. Priority volumes are thinner after 2017, with a single priority in 2024, suggesting selective filing. The key watchpoint is converting the 11 pending applications and recent wireless filings into enforceable assets that anchor the next growth phase.
Disclaimer: This article is published for informational and exemplary representation purposes only, based on publicly available patent databases and information. The article does not constitute legal opinion, patent counsel, or IP strategy advice, and IIPRD does not warrant the accuracy, completeness, or currency of the data represented. The analysis is exemplary in nature. Neither IIPRD nor any of its Partners, Employees, Associates, and/or Affiliates assume or admit any liability arising from this article or the information provided therein. Readers seeking actionable IP legal advice should consult qualified patent professionals.
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