Vibration damper and spacer damper patents: concentration, filing trends and where claim space is still open
Five filers hold 65.1% of the field. The top five assignees account for 69 of the 106 records in scope, leaving a long tail of 31 companies with a handful of filings each. Filings rose to a peak of 13 in 2019, then fell across the following complete years; from 2021 to 2024 they dropped 88%, from 8 to 1. The 2025 and 2026 figures are still incomplete because of publication lag and should not be read as a continuation of decline.
- 1A SALVI & C SPA20
- 2LINEVISION INC19
- 3ALUMINUM COMPANY OF AMERICA16
- 4AMPACIMON7
- 5SLATER STEEL INDS7
See the full vibration dampers and spacer dampers 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 vibration damper patents
Who holds the most vibration damper and spacer damper patents?
The ranked dataset of 36 assignees shows one company clearly ahead, with 20 of the 106 records in scope, more than double the fifth-place company's 7 records. The next four positions form a cluster of established overhead-line hardware manufacturers and grid-related entities, together with the leader accounting for 65.1% of all records. Beyond the top ten, filing volume drops to one or two records per company, so competitive risk is concentrated among a small group rather than spread evenly across the field.
Is patent filing activity for vibration dampers increasing or slowing down?
Filings peaked at 13 in 2019 and declined through the most recent complete year, falling 88% from 8 filings in 2021 to 1 in 2024. Figures for 2025 and 2026 are still incomplete because patent publication typically lags filing by around 18 months, so those years should not yet be read as continuing the decline. Taken together, the data points to a genuine pullback through 2024 rather than a permanently shrinking field.
What does US20180233891A1 actually cover?
US20180233891A1, filed by Hubbell, claims a motion control device combining a phase spacer with two spacer dampers, each damper separating conductors of a different phase. The claim structure bundles the damping hardware with the phase-spacer assembly rather than claiming a standalone vibration-damping mechanism. Anyone designing a phase spacer with integrated dampers for multi-phase conductor separation should review this filing's specific claim language before finalizing a design.
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 Vibration Dampers and Spacer Dampers 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.