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Patent portfolio assigned to AlgenAir (verified via public assignee records). Estimated patent count: 1. AlgenAir (Baltimore/Pittsburgh) makes the 'aerium' algae air purifier. Patent application US20200360856 confirmed assigned to AlgenAir, LLC ('Air Purifying Photobioreactor...'); at least 1 patent filing confirmed. Pittsburgh International Airport ran a commercial-unit pilot (case_study/partner). Competitors are algae/natural-CO2 air-purifier peers from press and CBI.