---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-23-043159"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2023-04-07T23:59:59+00:00"
generated_at: "2026-06-17T04:31:22.406812+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# ClearSign updates 2022 ops: 20-burner California project test passed, hydrogen burner tests, new market sales

## Summary
- Final witness testing completed for 20-burner refinery project; data sent to air district; manufacturing due later in 2023.
- Phase 1 testing of ultra-low NOx 100% hydrogen burner successful; seeking up to $1.6M Phase 2 grant.
- Entered Texas Gulf Coast with first boiler burner sale to a global chemical company; installation scheduled Q3 2023.
- Two boiler burner sales in California: one to medical/waste services (Q2 install), one to recycling services with California Boiler (Q3 install).
- Cash & short-term investments $9.1M as of Dec 31, 2022; 38.0M shares outstanding.

## SEC filing metadata
- accession: 0001104659-23-043159
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2023-04-07T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465923043159/0001104659-23-043159-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465923043159/tm2312141d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-23-043159
- JSON: https://secwatch.observer/filing/0001104659-23-043159.json
- Plain text: https://secwatch.observer/filing/0001104659-23-043159.txt

## Key facts
- Earnings Releases
  ClearSign Technologies Corp reported financial results for the full year ended December 31, 2022.
  - Period: the full year ended December 31, 2022
  - Result: reported results
  source text: ClearSign Technologies Corporation Provides Full Year 2022 Update
  evidence_url: https://www.sec.gov/Archives/edgar/data/1434524/000110465923043159/0001104659-23-043159-index.htm

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