SilcoTek v. Waters Corp: CVD Coating Patents Collapse After Claim Construction
SilcoTek Corporation alleged that Waters Corporation’s liquid chromatography products infringed two U.S. patents covering chemical vapor deposition surface coatings. After a pivotal claim construction ruling in November 2024, the case ended with a stipulated non-infringement judgment on the ‘020 Patent and a with-prejudice dismissal of the ‘986 Patent — across 879 days of litigation in Delaware.
Claim construction defeats SilcoTek’s two-front CVD coating campaign
On March 16, 2023, SilcoTek Corporation filed suit against Waters Corporation in the Delaware District Court, asserting infringement of US11131020B2 (the ‘020 Patent) and US10881986B2 (the ‘986 Patent). Both patents relate to chemical vapor deposition coatings applied to surfaces used in liquid chromatography systems and components — a technically demanding area where surface inertness directly impacts analytical performance.
The case’s trajectory was set by Judge Noreika’s Claim Construction Order of November 15, 2024, issued following a Markman hearing in June 2024. The construed claim terms led the parties to stipulate that Waters’ accused LC products had not infringed and do not infringe any asserted claim of the ‘020 Patent — effectively a defendant win on the merits. Separately, the ‘986 Patent was dismissed with prejudice after the court denied SilcoTek’s earlier attempt to exit that claim without prejudice, and SilcoTek ultimately agreed to a with-prejudice dismissal in exchange for Waters waiving its right to seek attorneys’ fees and withdrawing a pending Rule 11 motion.
The 879-day duration reflects the complexity of a two-patent CVD coating dispute requiring full claim construction briefing and hearing before resolution. What the public record does not reveal is the precise claim term or terms whose construction proved dispositive against SilcoTek’s infringement theory, nor whether SilcoTek intends to appeal the ‘020 Patent non-infringement judgment — a path the stipulation explicitly preserves. The Rule 11 motion threat, ultimately bargained away, suggests Waters viewed at least some aspects of the ‘986 Patent assertion as lacking a reasonable legal basis.
Filing to Case Dismissed in 879 days
879 days in Delaware District Court — above the median for two-patent infringement actions
Two-patent takedown: what the stipulated outcome means for each party
Claim construction drove a stipulated non-infringement judgment
After Judge Noreika construed the disputed claim terms in November 2024, SilcoTek and Waters stipulated that the accused LC products do not infringe any asserted claim of the ‘020 Patent. This is a final, appealable judgment — not merely a dismissal. On the ‘986 Patent, the court first denied SilcoTek’s motion to exit without prejudice, forcing a with-prejudice dismissal under Rule 41(a)(1)(A)(ii), which bars any future re-assertion of those claims.
Claim construction + Rule 41 dismissalSilcoTek loses both patents but retains appeal rights on the ‘020
SilcoTek faces a final judgment of non-infringement on the ‘020 Patent and a with-prejudice bar on any future assertion of the ‘986 Patent. However, the stipulation explicitly preserves the right to appeal the ‘020 Patent ruling — and allows Waters’ invalidity defenses to that patent to be revived if the case proceeds post-appeal. SilcoTek’s commercial licensing leverage over CVD coatings for LC systems is materially weakened unless appeal succeeds.
Appeal rights preserved on ‘020 PatentWaters clears both patents and waives fee exposure on the ‘986
Waters obtained its primary objective — a final non-infringement judgment on the ‘020 Patent — and escaped the ‘986 Patent without a merits ruling. In exchange, it agreed to waive attorneys’ fees and withdraw its Rule 11 motion relating to the ‘986 Patent. Waters retains full rights to seek fees and file Rule 11 motions on the ‘020 Patent, preserving meaningful post-appeal leverage. The outcome confirms Waters’ LC product designs survive both asserted coating patents at this stage.
Non-infringement judgment securedCVD coating IP for chromatography faces a narrowed enforcement landscape
The outcome suggests that claim construction poses a significant hurdle for broad CVD coating patents when applied to commercial LC instrument designs. Competitors and instrument manufacturers in analytical chemistry should note that a successful Markman defence can collapse a two-patent assertion without trial. For coating technology licensors, this case signals the importance of claim drafting that withstands judicial construction against well-resourced instrument OEMs like Waters.
Markman risk for coating IPFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | SilcoTek Corporation | Company | CVD surface coating technology licensor — holder of US11131020B2 and US10881986B2Search in Eureka ↗ |
| Defendant | Waters, Corp. | Company | Waters Corporation — global manufacturer of liquid chromatography instruments and consumablesSearch in Eureka ↗ |
| Plaintiff counsel | Barry J. Coyne | Attorney | Counsel for SilcoTek CorporationSearch in Eureka ↗ |
| Plaintiff counsel | Cecilia R. Dickson | Attorney | Counsel for SilcoTek CorporationSearch in Eureka ↗ |
| Plaintiff counsel | Francis DiGiovanni | Attorney | Counsel for SilcoTek CorporationSearch in Eureka ↗ |
| Plaintiff counsel | Kent E. Baldauf , Jr. | Attorney | Counsel for SilcoTek CorporationSearch in Eureka ↗ |
| Plaintiff counsel | Thatcher A. Rahmeier | Attorney | Counsel for SilcoTek CorporationSearch in Eureka ↗ |
| Plaintiff law firm | Faegre Drinker Biddle & Reath LLP | Law Firm | Representing SilcoTek CorporationSearch in Eureka ↗ |
| Defendant counsel | Alexis Stombaugh | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant counsel | Carson D. Anderson | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant counsel | Colin Aaron Keith | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant counsel | Jeffrey A. Miller | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant counsel | Mark E. Raftrey | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant counsel | Matthew M. Wolf | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant counsel | Neda Dadpey | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant counsel | Pilar Gabrielle Kraman | Attorney | Counsel for Waters, Corp.Search in Eureka ↗ |
| Defendant law firm | Young Conaway Stargatt & Taylor, LLP | Law Firm | Representing Waters, Corp.Search in Eureka ↗ |
| Presiding judge | Judge Maryellen Noreika | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The verdict is structured as a joint stipulation rather than a contested judgment — a common resolution mechanism after claim construction devastates a plaintiff’s infringement theory. The ‘020 Patent yields a final, appealable non-infringement judgment, while the ‘986 Patent exits via a with-prejudice Rule 41 dismissal negotiated under pressure from a pending Rule 11 motion. The fee-waiver exchange is commercially significant: it suggests Waters assessed that the cost of fee litigation on the ‘986 Patent was comparable to or less than the certainty value of a with-prejudice bar. The stipulation’s explicit preservation of appeal rights and of Waters’ invalidity defenses signals that this case may have a Federal Circuit sequel.
US11131020B2 and US10881986B2 — CVD surface coatings for liquid chromatography
US11131020B2 (application no. 16/870034) and US10881986B2 (application no. 16/282626) both cover chemical vapor deposition surface coating technology applied to components used in liquid chromatography systems. CVD coatings in the LC context are used to render surfaces inert, reducing analyte adsorption and improving analytical accuracy — a technically critical property for pharmaceutical, environmental, and clinical LC applications. The patents derive from related application lineages, suggesting overlapping inventive scope with potential continuation relationships.
For the LC instrument sector, these patents represent an attempt by a specialty coating licensor to extend IP protection into the hardware designs of major chromatography OEMs. Waters Corporation, as one of the world’s largest LC instrument manufacturers, was a commercially significant enforcement target. The claim construction ruling limiting the ‘020 Patent’s scope against Waters’ accused products may create prior art or prosecution history estoppel arguments that affect the enforceability of related SilcoTek patents across the sector. Competitors sourcing or manufacturing CVD-coated LC components should monitor both the appeal trajectory and SilcoTek’s broader portfolio.
Should your LC product team run an FTO against US11131020B2?
Any company manufacturing, importing, or selling liquid chromatography instruments, columns, fittings, or flow-path components that incorporate CVD or silicon-based inert surface coatings should treat this case as a trigger for FTO review. The non-infringement judgment in favour of Waters was claim-construction-specific and product-specific — it does not create a blanket clearance for other LC designs or coating processes. SilcoTek retains the ‘020 Patent (appeal pending) and broader portfolio rights, meaning future assertion risk remains real for the sector.
PatSnap Eureka’s FTO Search Agent can map US11131020B2 and US10881986B2 claim scope against your specific coating process and substrate configurations, flag continuation and divisional patents in the SilcoTek family, and identify relevant prior art that informed the Delaware claim construction. R&D teams developing next-generation inert coatings for LC flow paths should use Eureka to benchmark design-around options before committing to product architectures that overlap with SilcoTek’s asserted claim language.
Run a freedom-to-operate analysis on US10881986B2 to assess your product’s exposure
Run FTO in Eureka →Similar CVD coating and chromatography patent cases in Delaware and beyond
Cases involving surface coating patents asserted against analytical instrument OEMs in Delaware District Court — with comparable claim construction dynamics and dismissal patterns.
What this case signals for the analytical instruments IP landscape
A claim construction ruling ended both CVD coating patent claims before trial — a pattern worth watching across the LC and surface chemistry sector.
Markman hearings are the decisive battleground in materials coating IP
This case confirms that in CVD and surface treatment patent disputes, the Markman hearing is often dispositive. Once claim terms are construed narrowly, infringement theories built on broad coating process claims can collapse before trial ever begins. Patent holders in surface chemistry should stress-test claim language against likely judicial constructions before filing.
Rule 11 threat signals fee risk in analytically weak patent assertions
Waters served a Rule 11 motion on SilcoTek’s counsel in January 2025 — a rare and aggressive tactic. That SilcoTek negotiated its waiver as a condition of the with-prejudice ‘986 dismissal suggests at least perceived vulnerability in the ‘986 assertion. Defendants in similar LC or coating patent cases should evaluate fee motion leverage early when claim construction exposure is high.
SilcoTek v Waters — key questions answered
The case closed on August 11, 2025 with a stipulated non-infringement judgment in favour of Waters on the ‘020 Patent (US11131020B2), following a November 2024 claim construction order. The ‘986 Patent (US10881986B2) was dismissed with prejudice under Rule 41, with each party bearing its own costs and Waters waiving attorneys’ fees on that patent.
SilcoTek asserted two U.S. patents: US11131020B2 (application 16/870034) and US10881986B2 (application 16/282626). Both cover chemical vapor deposition surface coating technology relevant to liquid chromatography system components. The ‘020 Patent resulted in a non-infringement judgment; the ‘986 Patent was dismissed with prejudice.
SilcoTek initially moved to dismiss the ‘986 Patent claims without prejudice on March 26, 2025, but Judge Noreika denied that motion on June 24, 2025. Following that ruling, SilcoTek agreed to a with-prejudice dismissal in exchange for Waters waiving its right to seek attorneys’ fees on the ‘986 Patent and withdrawing a Rule 11 motion it had served in January 2025.
Yes. The stipulation expressly makes the non-infringement judgment on the ‘020 Patent final and appealable, and preserves SilcoTek’s right to appeal. If the case proceeds after appeal, Waters retains the right to revive its invalidity defenses to the ‘020 Patent claims. SilcoTek also retains the right to use the stipulation in any appellate record.
Claim construction was the decisive turning point. Judge Noreika issued a Claim Construction Order on November 15, 2024, following a Markman hearing on June 12, 2024. The construed claim terms led the parties to stipulate that Waters’ accused LC products do not infringe any asserted claim of the ‘020 Patent. The case illustrates how a single Markman ruling can effectively end a multi-patent infringement action before trial.
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