www.google.com.auhttp://www.google.com.au/patents/US3905783?utm_source=gb-gplus-sharePatent US3905783 - METHOD OF PURIFYING AN AIR OR GAS FLOW OF VAPOROUS OR GASEOUS IMPURITIES ADSORBABLE IN FILTERS
METHOD OF PURIFYING AN AIR OR GAS FLOW OF VAPOROUS OR GASEOUS IMPURITIES ...
