Electrically heated nursing bottles

Claim 1

A NURSING BOTTLE INCLUDING AN OPEN ENDED SLEEVE, A PAIR OF CAPS DETACHABLY CONNECTED TO THE ENDS OF SAID SLEEVE, A TUBE HAVING ONE END CONNECTED TO ONE OF SAID CAPS EXTENDING INTO THE INTERIOR OF SAID SLEEVE AND HAVING A FREE END ADJOINING THE OTHER OF SAID CAPS, A PAIR OF NIPPLES IN TELESCOPING RELATION ON SAID ONE CAP IN COMMUNICATION WITH SAID TUBE, SAID NIPPLES HAVING APERTURED ENDS IN SPACED RELATION TO PROVIDE A CHAMBER BETWEEN THE NIPPLE ENDS, THE OUTER OF SAID NIPPLES HAVING A SMALLER TOTAL AREA OF OPENINGS THAN THE INNER OF SAID NIPPLES, A PARTITION IN SAID SLEEVE THROUGH WHICH SAID TUBE EXTENDS AND ADJOINING SAID ONE CAP, AN AUXILIARY PASSAGE THROUGH SAID PARTITION AND COMMUNICATING WITH THE INTERIOR OF SAID NIPPLES AND WITH THE INTERIOR OF THE SLEEVE BETWEEN THE PARTITION AND THE OTHER END CAP, A CHECK VALVE NORMALLY CLOSING SAID TUBE AND OPERABLE BY THE PRESENCE OF PARTIAL VACUUM WITHIN SAID NIPPLES TO OPEN, AND A CHECK VALVE IN SAID AUXILIARY PASSAGE NORMALLY CLOSED WHEN SAID SLEEVE IS UPRIGHT AND OPEN WHEN SAID SLEEVE IS INVERTED.