Patent ID: 6981498

Claim:
An improved double-walled grease collection tank for use in a waste grease collection system including a truck-mounted grease transport tank, lift means for handling and dumping individual on-site grease collection tanks into the truck grease transport tank, and an intermediate stage heating bath into which the double-walled grease collection tank is deposited temporarily to liquify grease in contact with the inner surfaces of the collection tank in order to facilitate dumping the contents thereof, the improvement wherein said double-walled grease collection tank comprises an inner container portion defined by an inner bottom wall and integrally joined upwardly extending inner sidewalls, an outer container portion defined by an outer bottom wall and integrally joined upwardly extending outer sidewalls, the inner container portion being received in the outer container portion with the bottom walls and sidewalls of the inner and outer container portions being disposed in opposed spaced relation to define an open space therebetween, flange means rigidly joining said inner and outer container portions at or near a top portion of their respective sidewalls, at least one fill opening formed in at least one of said sidewalls of said outer container portion adjacent its bottom wall, at least one vent opening in said double-walled collection container near its top portion, and fill opening closure means removably mounted in each said at least one fill opening for closing and sealing the fill opening.