secwatch.observer — SEC 8-K summary
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Issuer:     Arbutus Biopharma Corp (ABUS)
CIK:        0001447028
Form:       8-K
Filed at:   2026-02-06T23:59:59+00:00
Accession:  0001171843-26-000676
Event type: litigation
Sentiment:  neutral
Materiality: 0.85
Item codes: 8.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

Arbutus patent case vs Moderna to proceed in Delaware; Section 1498 defense limited
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- Court denies Moderna's summary judgment on Section 1498 for most vaccine doses; only government employee doses go to Court of Federal Claims.
- Prosecution history estoppel bars Arbutus from asserting doctrine of equivalents on molar ratio claims; literal infringement required.
- Indefiniteness challenges dismissed; factual disputes on patent validity reserved for jury.
- Case covers 500M+ doses of Moderna's COVID-19 vaccine; $8.2B in government spending referenced.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1447028/000117184326000676/0001171843-26-000676-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1447028/000117184326000676/f8k_020626.htm
  HTML page:      https://secwatch.observer/filing/0001171843-26-000676

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer