Vertical and lateral interlocking packing case

Claim 1

A VERTICAL WALLED PACKING CASE OF RECTILINEAR HORIZONTAL CROSS SECTION FORMED OF MOLDED FOAM SYNTHETIC PLASTIC MATERIAL HAVING MULTIPLICITY OF CLOSED NON-COMMUNICATING CELLS AND A LBS./CU. FT. DENSITY OF MORE THAN 0.7 TO LESS THAN 2, SAID CASE HAVING COVER AND BASE SECTIONS WITH RECTILINEAR MATCHING FACES AND PROVIDING IN EACH SAID SECTIONS FORM-FITTING SEMI-POCKET PORTIONS OPENING AT SAID MATCHING FACES OF SIZE AND SHAPE COOPERATIVELY TO SNUGLY ENCLOSE A FRAGILE ARTICLE OF PREDETERMINED SIZE AND SHAPE UPON ASSEMBLY OF SAID SECTIONS WITH SAID MATCHING FACES IN ENGAGEMENT AND IN REGISTERING RELATION, SAID BASE AND COVER SECTIONS PROVIDING COOPERATING AND INTERFITTING EXTENSION AND RECEPTACLE MEMBERS ADAPTED TO MAINTAIN SAID MATCHING FACES IN SUCH RELATION, SAID BASE SECTION PROVIDING A PAIR OF SPACED PROTRUSIONS FROM THE BOTTOM THEREOF EQUIDISTANT FROM A FIRST SIDE THEREOF AND EQUIDISTANT FROM THE SIDES THEREOF INTERSECTING SAID FIRST SIDE, A SECOND PAIR OF SPACED PROTRUSIONS EQUIDISTANT FROM THE SIDE THEREOF OPPOSITE SAID FIRST SIDE AND EQUIDISTANT FROM SAID INTERSECTING SIDES, SOCKETS MOLDED IN THE UPPER FACE OF SAID COVER SECTION CORRESPONDING IN DIMENSION, NUMBER AND LOCATION WITH RESPECT TO THE SIDES THEREOF TO THE AFORESAID TWO PAIRS OF PROTRUSIONS, TWO PAIRS OF ADDITIONAL SIMILARLY DIMENSIONED SOCKETS, ONE PAIR THEREOF BEING DISPOSED IN ALIGNMENT WITH AND BETWEEN THE PAIR OF SOCKETS ADJACENT ONE SIDE OF SAID UPPER FACE AND THE OTHER PAIR BEING SIMILARLY DISPOSED WITH RESPECT TO THE PAIR OF SOCKETS ADJACENT THE OPPOSITE SIDE OF SAID UPPER FACE, EACH OF THE SOCKETS OF SAID LAST NAMED TWO PAIRS THEREOF BEING SPACED FROM A LINE PERPENDICULAR TO AND BISECTING THE LAST NAMED OPPOSITE SIDES OF SAID UPPER FACE BY A DISTANCE SUBSTANTIALLY EQUAL TO THAT BETWEEN EACH OF THE END SOCKETS ALIGNED THEREWITH AND THE ADJACENT SIDE OF SAID UPPER FACE INTERSECTING THE SAID OPPOSITE SIDES THEREOF, WHEREBY SAID PACKING CASE MAY BE STACKED IN INTERLOCKING RELATION WITH RESPECT TO SIMILAR CASES THEREABOVE AND THEREBELOW SELECTIVELY IN VERTICAL ALIGNMENT AND IN SNUGLY FITTING STAGGERED RELATIONSHIP.