Centrifuges with retainers, retainers, and bottle stoppers for use therewith

Claim 1

IN COMBINATION, A CENTRIFUGE HEAD OF THE TYPE HAVING A CENTRAL, UPWARDLY OPENING, CYLINDRICAL CAVITY AND FOR USE WITH PLASTIC BOTTLES EACH HAVING A STRAIGHT SIDED CYLINDRICAL CONTAINER PART AND A CAP OF SMALLER CROSS SECTIONAL AREA, SAID HEAD HAVING A PLURALITY OF SMALLER, BOTTLE-RECEIVING, CYLINDRICAL CAVITIES OPENING INTO THE BOTTOM OF THE CENTRAL CAVITY AND HAVING THEIR OWN AXES OUTWARDLY AND DOWNWARDLY INCLINED, EACH BOTTLE RECEIVING CAVITY BEING STRAIGHT SIDED AND DIMENSIONED TO SNUGLY RECEIVE SUCH A BOTTLE WITH ITS CAPPED END PROTRUDING INTO SAID CENTRAL CAVITY, AND A CYLINDRICAL RETAINER DIMENSIONED TO FIT SNUGLY WITHIN SAID CENTRAL CAVITY AND TO BE CENTERED THEREBY, SAID RETAINER INCLUDING A PLURALITY OF DOWNWARDLY OPENING SEATS, ONE ABOVE EACH BOTTLE RECEIVING CAVITY, EACH SEAT INCLUDING ARCUATE PORTIONS WHOSE AXES ARE OUTWARDLY AND DOWNWARDLY INCLINED WITH EACH IN ALINEMENT WITH THE AXIS OF AN APPROPRIATE ONE OF SAID BOTTLE RECEIVING CAVITIES, THE ARCUATE PORTIONS OF EACH SEAT BEING DIMENSIONED TO SNUGLY RECEIVE THE OUTWARDLY DISPOSED SURFACES OF A CAPPED END OF A BOTTLE SUPPORTED IN THE SUBJACENT BOTTLE RECEIVING CAVITY IN A ZONE INCLUSIVE OF THE JUNCTION OF THE CENTRAL CAVITY WITH EACH BOTTLE RECEIVING CAVITY AND OF AN ARCUATE EXTENT OPPOSING DISTORTION OF THAT BOTTLE WHILE IN A CENTRIFUGAL FIELD.