Accessibility StatementSkip Navigation CALGARY, AB, Sept. 24, 2025 /PRNewswire/ - Northstar Clean Technologies Inc. (TSXV: ROOF) (OTCQB: ROOOF) ("Northstar" or the "Company") is pleased to announce it successfully separated and recovered limestone from asphalt shingles, adding a fourth product line for the Company. Northstar has also been issued a new patent (the "Patent") by the United States Patent and Trademark Office ("USPTO") for this limestone recovery portion of the Company's proprietary asphalt shin ...