---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-037137"
form_type: "8-K"
ticker: "LQDA"
cik: "0001819576"
company_name: "Liquidia Corp"
filed_at: "2025-04-22T23:59:59+00:00"
generated_at: "2026-05-23T09:28:36.934422+00:00"
event_type: "litigation"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Liquidia files patent infringement suit against United Therapeutics over treprostinil dry powder patent

## Summary
- Filed lawsuit on April 21, 2025 in the Middle District of North Carolina against United Therapeutics.
- Alleges infringement of U.S. Patent No. 10,898,494 covering dry powder treprostinil for pulmonary hypertension.
- Action filed by Liquidia Technologies, Inc., a wholly owned subsidiary of Liquidia Corporation.
- Patent infringement claim seeks remedy for unauthorized use of Liquidia's dry powder treprostinil technology.

## SEC filing metadata
- accession: 0001104659-25-037137
- form_type: 8-K
- ticker: LQDA
- cik: 0001819576
- company_name: Liquidia Corp
- filed_at: 2025-04-22T23:59:59+00:00
- event_type: litigation
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1819576/000110465925037137/0001104659-25-037137-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1819576/000110465925037137/tm2512826d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-037137
- JSON: https://secwatch.observer/filing/0001104659-25-037137.json
- Plain text: https://secwatch.observer/filing/0001104659-25-037137.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.