Precast insulating masonry unit and insulating filler

Claim 1

AN INSULATED BUILDING BLOCK COMPRISING A PREFORMED MONOLITHIC HOLLOW MASONRY BLOCK HAVING A PAIR OF UPSTANDING SIDE WALLS CONNECTED BY A PLURALITY OF UPSTANDING, LONGITUDINALLY SPACED AND TRANSVERSELY EXTENDING PARTITIONS DEFINING UPWARDLY OPENING RECESSES THEREBETWEEN, PORTIONS OF EACH OF SAID PARTITIONS TERMINATING UPWARDLY A SPACED DISTANCE BELOW THE UPPER EDGES OF SAID SIDE WALLS AND DEFINING A LONGITUDINAL PASSAGE THROUGH SAID BLOCK, A ONE-PIECE ELONGATED AND GENERALLY HORIZONTAL FILLER OF HEAT INSULATING AND PREFORMED MATERIAL, SAID FILLER INCLUDING AN UPPER LONGITUDINAL PORTION EXTENDING THROUGH SAID PASSAGE AND DEPENDING PORTIONS SPACED LONGITUDINALLY ALONG SAID LONGITUDINAL PORTION AND RECEIVED IN SAID RECESSES.