Vapor-liquid contact trays

Claim 1

A VAPOR-LIQUID CONTACT TRAY INCLUDING AT LEAST A PAIR OF SECTIONS HAVING ADJACENT EDGE PORTIONS IN OVERLAPPING SUBSTANTIALLY PARALLEL RELATIONSHIP, THE SECTIONS HAVING SUBSTANTIALLY FLAT MAJOR PORTIONS, A SUBSTANTIALLY HORIZONTAL SHOULDER ON THE ADJACENT EDGE PORTION OF THE FIRST OF SAID SECTIONS OFFSET DOWNWARDLY A DISTANCE SUBSTANTIALLY EQUAL TO THE THICKNESS OF SAID SECTIONS, THE MAJOR PORTION OF SAID FIRST SECTION HAVING AN UPRIGHT MARGIN CONTIGUOUS THE HORIZONTAL DOWNWARDLY OFFSET SHOULDER, THE ADJACENT EDGE PORTION OF THE SECOND OF SAID SECTIONS RESTING ON SAID SHOULDER IN CLOSE PROXIMITY TO THE UPRIGHT MARGIN AND SUPPORTING THE MAJOR PORTION OF SAID SECOND SECTION IN COPLANAR RELATION TO SAID MAJOR PORTION OF SAID FIRST SECTION, SAID MAJOR PORTION OF SAID FIRST SECTION ADJACENT ITS UPRIGHT MARGIN BEING OFFSET DOWNWARDLY AT SPACED INTERVALS TO PROVIDE A PLURALITY OF RECESSES HAVING BOTTOMS SUBSTANTIALLY COPLANAR WITH SAID SHOULDER, AND FRICTIONAL FASTENERS MOUNTED IN THE RECESSES IN TRANSVERSELY SPACED RELATION TO SAID ADJACENT EDGE PORTION OF SAID SECOND SECTION AND OVERLYING SAID ADJACENT EDGE PORTION OF SAID SECOND SECTION TO CLAMP THE SAME AGAINST UPWARD DISPLACEMENT RELATIVE TO SAID SHOULDER.