US Synthetic v. CR Gems & Element Six: ITC Finds Section 337 Violation in PDC Patent Case
US Synthetic Corp. filed a Section 337 complaint at the USITC in May 2025 asserting five patents covering polycrystalline diamond compact (PDC) technology against 26 global respondents including Element Six, Iljin Diamond, and SF Diamond. After 189 days, Administrative Law Judge Cameron Elliot issued a violation finding — a plaintiff win on the merits that typically triggers an exclusion order barring infringing imports into the United States.
ITC delivers sweeping PDC patent victory for US Synthetic
US Synthetic Corp., a Utah-based manufacturer and holder of foundational polycrystalline diamond compact patents, filed ITC Investigation No. 337-TA-1236 on 29 May 2025 before Administrative Law Judge Cameron Elliot. The complaint named 26 respondents spanning China, South Korea, the UK, Germany, South Africa, Ireland, Japan, and the United States — a respondent roster that signals a deliberate strategy to address the full global supply chain importing PDC products into the US market.
The investigation closed on 4 December 2025 — 189 days after filing — with ALJ Elliot issuing a participant disposition finding a Section 337 violation, and the basis of termination recorded as judgment on the merits for the plaintiff. At the ITC, a violation finding at the ALJ level is followed by Presidential review and typically results in a general exclusion order or limited exclusion order barring importation of the infringing goods, along with cease-and-desist orders against named US respondents.
The 189-day resolution is notably swift for a multi-respondent ITC investigation of this complexity; the typical ITC target for Section 337 investigations is approximately 15 months. Whether all respondents contested the matter or some entered consent orders is not apparent from the public docket data. The Presidential review period and any full Commission review could modify the remedy, and downstream domestic industry and public interest determinations remain part of the Commission’s standard process.
Filing to Judgment on the merits for Plaintiff in 189 days
189 days — faster than the typical ITC 15-month target, suggesting streamlined proceedings
ITC violation found: what the Section 337 ruling means for both parties
What a Section 337 violation finding means at the ITC
A violation finding by the ALJ means the presiding judge determined that the respondents imported articles that infringe valid US patent claims and that a domestic industry exists. The finding proceeds to full Commission review before a remedy — typically an exclusion order — is issued. The 60-day Presidential review period then applies. This is not a district court damages award; the remedy is trade-based import exclusion.
Import exclusion remedy likelyUS Synthetic secures merits win on five PDC patents
A Section 337 violation finding vindicates US Synthetic’s assertion that its five PDC patents are valid and infringed. If the Commission upholds the finding and issues a general exclusion order, competing PDC products from any source — not just named respondents — could be blocked at US ports of entry. This significantly strengthens US Synthetic’s commercial position in the domestic PDC supply chain, particularly for oil and gas drilling applications.
Potential general exclusion order26 respondents face import bar and cease-and-desist risk
Named respondents including Element Six, Iljin Diamond, SF Diamond, and over 20 others face the prospect of US import exclusion orders and cease-and-desist orders. Respondents may seek Commission review to challenge the ALJ’s findings on infringement or validity. Those who did not contest may already be operating under consent orders. Any party seeking to continue US market access will likely need to design around the asserted claims or negotiate a licence.
Licence or design-around requiredPDC supply chain disruption risk across drilling and industrial markets
Polycrystalline diamond compacts are critical components in oil and gas drill bits and industrial cutting tools. A broad exclusion order could constrain supply for US purchasers relying on imports from named respondents. Downstream customers — drill bit OEMs and energy service companies — should assess their supply chain exposure now. The breadth of the respondent list suggests US Synthetic is targeting the entire non-licensed import channel, not a single competitor.
Supply chain exposure for OEMsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | US Synthetic, Corp. | Company | Polycrystalline diamond compact manufacturer — holder of US9315881B2 and four related PDC patentsSearch in Eureka ↗ |
| Defendant | CR Gems Superabrasives Co., Ltd | Company | 26 global respondents: superabrasive and PDC manufacturers and distributors across China, South Korea, Europe, and the USSearch in Eureka ↗ |
| Co-Defendant | Element Six Global Innovation Centre | Individual | Search in Eureka ↗ |
| Co-Defendant | Element Six GmbH | Company | Search in Eureka ↗ |
| Co-Defendant | Element Six Hard Materials (Wuxi) Co., Limited | Company | Search in Eureka ↗ |
| Co-Defendant | Element Six Limited | Individual | Search in Eureka ↗ |
| Co-Defendant | Element Six Production (Pty) Limited | Individual | Search in Eureka ↗ |
| Co-Defendant | Element Six Technologies US Corporation | Company | Search in Eureka ↗ |
| Co-Defendant | Element Six Trading (Shanghai) Co. Limited | Company | Search in Eureka ↗ |
| Co-Defendant | Element Six US Corporation | Company | Search in Eureka ↗ |
| Co-Defendant | FIDC Beijing Fortune International Diamond | Individual | Search in Eureka ↗ |
| Co-Defendant | Fujian Wanlong Superhard Material Technology Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Guangdong Juxin New Materials Technology Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Henan Jingrui New Material Technology Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Iljin China Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Iljin Diamond Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Iljin Europe, GmbH | Company | Search in Eureka ↗ |
| Co-Defendant | Iljin Holdings Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Iljin Japan Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Iljin USA, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | International Diamond Services, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | SF Diamond Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | SF Diamond USA, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | Servsix US | Individual | Search in Eureka ↗ |
| Co-Defendant | Shenzhen Haimingrun Superhard Materials Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Synergy Materials Technology Limited | Individual | Search in Eureka ↗ |
| Co-Defendant | Zhengzhou New Asia Superhard Materials Composite Co., Ltd. | Company | Search in Eureka ↗ |
| Co-Defendant | Zhuhai Juxin Technology | Individual | Search in Eureka ↗ |
| Plaintiff counsel | Daniel C. Cooley | Attorney | Counsel for US Synthetic, Corp.Search in Eureka ↗ |
| Plaintiff law firm | Finnegan, Henderson, Farabow, Garrett & Dunner, LLP | Law Firm | Representing US Synthetic, Corp.Search in Eureka ↗ |
| Defendant counsel | Patrick McCarthy | Attorney | Counsel for CR Gems Superabrasives Co., LtdSearch in Eureka ↗ |
| Defendant law firm | Goodwin Procter LLP | Law Firm | Representing CR Gems Superabrasives Co., LtdSearch in Eureka ↗ |
| Presiding judge | Judge Cameron Elliot | Judge | United States International Trade CommissionSearch in Eureka ↗ |
Official order — verbatim text
The disposition records ‘Violation Found’ with termination on a merits judgment for the plaintiff — the strongest possible outcome at the ALJ stage of a Section 337 investigation. At the ITC, this phrasing indicates the ALJ found both infringement of valid patent claims and satisfaction of the domestic industry requirement. The finding does not automatically constitute a final Commission order; the full six-member Commission may review, modify, or adopt the ID. The scope of any resulting exclusion order — limited or general — will be determined at the Commission level following public interest analysis.
US9315881B2 — polycrystalline diamond compact compositions and sintering methods
The five asserted patents — US9315881B2, US10507565B2, US10508502B2, US8616306B2, and US9932274B2 — collectively cover polycrystalline diamond compact compositions, sintering processes, microstructural configurations, and manufacturing methods. PDC technology involves bonding diamond particles under extreme heat and pressure to create super-hard cutting elements used primarily in oil and gas drill bits. The application dates span filings from 2012 through 2019, reflecting a sustained prosecution strategy building a layered patent portfolio around core PDC innovations.
US Synthetic is recognised as a leading US manufacturer of PDC cutters for the energy sector, and this portfolio represents core commercial IP protecting its manufacturing methods and product configurations against lower-cost imports. The breadth of the portfolio — covering both composition claims and method claims — makes designing around the full claim set significantly more difficult for competitors. For superabrasives companies operating in the US market or exporting into it, each patent in the family warrants independent freedom-to-operate analysis, particularly given that method claims may attach to products regardless of where they are manufactured.
Should you run an FTO against US9315881B2 and the US Synthetic PDC portfolio?
Any company manufacturing, importing, or selling polycrystalline diamond compacts — or drill bits and cutting tools incorporating PDC cutters — into the United States should treat these five patents as a primary FTO priority. The ITC violation finding confirms the patents survived an adversarial validity challenge from well-resourced global respondents. Downstream customers including drill bit OEMs, energy service companies, and distributors of PDC-based tooling face indirect exposure if their supply chain touches any of the named respondents.
PatSnap Eureka’s FTO Search Agent allows R&D and IP teams to map their PDC product specifications against each of the five asserted claim sets, identify design-around opportunities, and monitor continuation applications from US Synthetic’s portfolio. The agent surfaces related family members, prosecution history, and cited prior art — enabling product teams to structure their development roadmap around the claim boundaries established in this investigation.
Run a freedom-to-operate analysis on US9315881B2 to assess your product’s exposure
Run FTO in Eureka →Similar ITC Section 337 cases in superabrasives and advanced materials
Explore comparable USITC Section 337 investigations involving polycrystalline diamond, superabrasive materials, and related advanced cutting-tool patent disputes.
What this ITC ruling signals for the PDC and superabrasives IP landscape
A multi-respondent Section 337 win covering five PDC patents reshapes the competitive dynamics of the US superabrasives market.
Five-patent assertion strategy raises the invalidity challenge bar
Asserting five patents simultaneously at the ITC forces respondents to mount validity challenges across multiple claim sets — a resource-intensive defence. A violation finding across all five suggests the asserted claims survived scrutiny. Competitors and their counsel should reassess prior art landscapes for each patent before any IPR or Commission review strategy.
General exclusion order potential makes this a supply-chain event, not just a bilateral dispute
Because US Synthetic targeted 26 respondents from multiple jurisdictions, conditions may exist for the Commission to issue a general exclusion order — one that applies to all importers, not just named parties. Any company importing PDC products into the US, even those not named, should monitor Commission proceedings and evaluate design-around options proactively.
US v CR — key questions answered
ALJ Cameron Elliot issued a violation finding in favour of plaintiff US Synthetic Corp., with the basis of termination recorded as judgment on the merits for the plaintiff. The finding covers Section 337 infringement of five polycrystalline diamond compact patents by 26 respondents. The case closed on 4 December 2025, 189 days after filing.
US Synthetic asserted five patents: US9315881B2, US10507565B2, US10508502B2, US8616306B2, and US9932274B2. All cover polycrystalline diamond compact (PDC) compositions, sintering methods, and manufacturing processes used in drill bits and industrial cutting tools. Application dates span 2012 to 2019.
The 26 respondents include CR Gems Superabrasives (China), Element Six entities (UK, Germany, South Africa, Ireland, US, China), Iljin Diamond and affiliates (South Korea, Japan, Germany, China, US), SF Diamond and SF Diamond USA, Fujian Wanlong, Henan Jingrui, Guangdong Juxin, Shenzhen Haimingrun, FIDC Beijing Fortune International Diamond, Synergy Materials Technology (Hong Kong), Zhengzhou New Asia, Zhuhai Juxin, and International Diamond Services (US).
Following an ALJ violation finding, the full Commission reviews the initial determination and may issue a limited exclusion order (against named respondents) or a general exclusion order (against all importers of infringing articles). Cease-and-desist orders may also be issued against US entities. A 60-day Presidential review period applies before orders take effect. Given the broad respondent base here, a general exclusion order is a plausible outcome, though the Commission conducts its own public interest analysis.
The USITC’s standard target for completing Section 337 investigations is approximately 15 months (roughly 450 days). Resolution in 189 days is significantly faster than average, which may suggest some respondents entered consent orders early, that the technical issues were narrowly contested, or that the ALJ expedited proceedings. The public docket does not confirm which respondents contested the merits versus settling, but the pace is consistent with partial consent order resolutions in large multi-respondent investigations.
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