DC Cable and Overhead Line Patents: Leaders & White Space 2026
DC Cable and Overhead Line Technology Patents
78.4% of records sit in H01B (cables, conductors & insulators) confirming that insulation and conductor design, not grid-system integration, is where the claim density actually lives. Filings peaked at 8 in 2017. The tracked comparison window, 2021 (2 filings) to 2024 (1 filing), shows a -50% change over three years — the most recent complete-year comparison available. Years after 2024 are still filling in under the publication lag and should not be read as a continued decline.
- 1SUMITOMO ELECTRIC INDUSTRIES LTD14
- 2LS CABLE & SYST LTD6
- 3STATE GRID LIAONING ELECTRIC POWER CO LTD6
- 4GENERAL ELECTRIC CO5
- 5STATE GRID CORPORATION OF CHINA5
See the full dc cable and overhead line technology analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on DC cable patenting
Who holds the most patents in HVDC cable insulation technology?
One assignee leads the ranked field with 14 records, well ahead of the fifth-ranked company at 5. The ranking covers 26 companies in total across the 51 records in scope, and the gap between first and fifth place suggests a sustained portfolio strategy rather than a single breakthrough filing. Beyond the top few positions the counts thin out quickly into a long tail of light filers.
Is HVDC cable patent filing activity growing or shrinking?
Filings peaked at 8 in 2017, and the most recent reliable comparison, 2021 (2 filings) to 2024 (1 filing), shows a -50% change over three years. Data for 2025 and 2026 is still incomplete because publication typically lags filing by around 18 months, so those later years should not yet be read as continuing the decline. Overall the trend points to a cooling from an earlier peak rather than an actively expanding field.
What technology areas dominate DC cable patent claims?
H01B, covering cables, conductors and insulators, appears in 78.4% of the 51 records in scope, and C08L, polymer compositions, appears in 45.1%. Together these confirm that the bulk of patenting activity concerns the physical cable construction and its polymer insulation formulation rather than grid integration or measurement systems. Smaller shares in additive chemistry (C08K) and grid systems (H02J) mark thinner but present adjacent activity.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on DC Cable and Overhead Line Technology covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.