Gear Grinding Patents: Top Companies & Filing Trends 2026
Gear Grinding and Profile Correction Patents: Who Holds the Claims
Concentrated at the top. the five leading assignees hold 60.8% of all 102 records in scope, and the ranked ten hold 81.4%. Annual filings rose from 2 in 2017 to a peak of 7 in 2021, then eased to 5 by 2024 — a 29% decline over that three-year window. Years after 2024 are still filling in as publications catch up, so treat the tail of the chart as a floor, not a ceiling.
- 1MITSUBISHI HEAVY IND MACHINE TOOL CO LTD23
- 2NORITAKE CO LTD13
- 3YUSHIRO CHEM IND CO LTD9
- 4TOYOTA MOTOR HOKKAIDO INC9
- 5IDEMITSU KOSAN CO LTD8
See the full gear grinding and profile correction 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 gear grinding patents
Who holds the most patents in gear grinding and profile correction?
One assignee leads clearly with 23 of the 102 records in scope, more than double the count held by the fifth-ranked company at 8. The top five combined hold 60.8% of all records, and the top ten hold 81.4%, so filing activity is concentrated among a small group of machine-tool builders, abrasives makers and their automotive partners rather than spread evenly across the 37 ranked assignees. Anyone drafting new claims in this space should check that leader’s portfolio first.
Is filing activity in gear grinding patents growing or slowing?
Annual filings rose from 2 in 2017 to a peak of 7 in 2021, then eased to 5 by 2024, a 29% decline over that three-year span. That is the cleanest year-over-year read the data supports, since 2025 and 2026 filings are still being published and will revise upward due to the roughly 18-month lag between filing and publication. Read the recent years as incomplete rather than as evidence of a sustained downturn.
What technologies dominate gear grinding patent claims?
B23F, the gear and thread cutting classification, appears on 64.7% of the 102 records, and B24B, grinding and polishing, appears on 39.2%, making the intersection of those two the densest claim territory. Supporting technologies show up less often: grinding tools and abrasives (B24D) at 14.7%, lubricants (C10M/C10N) each under 8%, and measurement or testing classes (G01N/G01M) each under 8%. Since a single record can carry multiple classes, these figures do not sum to 100% and should be read individually against the 102-record total.
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 Gear Grinding and Profile Correction 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.