Culture dish

Claim 1

A COVERED CULTURE DISH MADE OF TRANSPARENT STEAMRESISTANT AND HEAT-RESISTANT PLASITIC, SAID DISH COMPRISING: (A) A BASE MEMBER PROVIDED WITH A CIRCUMFERENTIAL WALL AND BEING PARTITIONED TO PROVIDE SEPARATE COMPARTMENTS IN SAID BASE MEMBER; (B) A LAYER OF ACTIVE NUTRIENT GEL MEDIA IN STERILE CONDITION IN EACH OF SAID COMPARTMENTS, THE ATMOSPHERE WITHIN SAID DISH ABOVE SAID LAYER BEING ALSO STERILE; (C) A TIGHTLY-FITTING COVER MEMBER HAVING A CIRCUMFERENTIAL WALL WHICH IN CLOSED POSITION TIGHTLY OVERLAPS THE WALL OF SAID BASE MEMBER, WHILE PERMITTING SLIDING AND RATIONAL MOVEMENT THEREBETWEEN; (D) A PLURALITY OF SLOTS FORMED IN THE WALL OF SAID BASE MEMBER AT OPPOSITE SIDES THEREOF; (E) THE CIRCUMFERENTIAL WALL OF SAID BASE MEMBER BEING OUTWARDLY AND DOWNWARDLY TAPERED, AT LEAST NEAR THE BOTTOM THEREOF, TO PROVIDE A TIGHT SEAL WITH SAID COVER MEMBER WHEN OVERLAPING SAID TAPERED PORTION, RENDERING THE DISH IN SUCH OVERLAPPING POSITION IMPERVIOUS TO AIR-BORNE DUST AND OTHER PARTICLES; (F) A SLOT FORMED IN THE WALL OF SAID COVER MEMBER FACILITATING FLEXING OF THE WALL OF SAID COVER MEMBER AS THE WALL OF SAID COVER MEMBER IS FORCED DOWN OVER THE TAPERED WALL OF SAID BASE MEMBER IN SEALING POSITION, WHEREBY ROTATION OF SAID COVER MEMBER RELATIVE TO SAID BASE MEMBER BRINGS THE SLOT IN SAID COVER MEMBER INTO REGISTRY RESPECTIVELY WITH EACH OF THE SLOTS IN THE BASE MEMBER TO PROVIDE A TEMPORARY OPENING INTO THE COVERED DISH, THROUGH WHICH AN IMPLEMENT CAN BE INSERTED FOR SEPARATE INOCULATION OF THE NUTRIENT LAYER IN EACH OF SAID COMPARTMENTS; (G) SAID BASE MEMBER BEING FURTHER PROVIDED WITH A LEDGE EXTENDING OUTWARDLY OF THE CIRCUMFERENTIAL WALL THEREOF, AND SAID LEDGE BEING FLUTED TO PROVIDE A HAND GROUP ON SAID BASE MEMBER TO FACILITATE MANUAL RELATIVE ROTATION BETWEEN SAID BASE MEMBER AND SAID COVER MEMBER.