Production of filter units for a filter apparatus

Claim 1

IN THE PRODUCTION OF A FILTER UNIT WHICH COMPRISES FILTERING SHEETS APPLIED OVER OPPOSITE FACES OF A HOLLOW FORAMINOUS DISC AND EXTENDED OUTWARDLY BEYOND THE PERIPHERY THEREOF, THE METHOD OF INTERCONNECTING AND SEALING THE SHEETS ADJACENT THEIR PERIPHERAL PORTIONS WHICH COMPRISES FIRST ASSEMBLING THE FILTER SHEETS IN PLACE UPON THE DISC, IN THEN SECURING THE SHEETS TOGETHER AT POINTS OUTWARDLY OF EACH DISC PERIPHERY, IN ASSEMBLING IN COAXIAL UNITARY RELATION A PLURALITY OF SUCH DISC WITH SECURED SHEETS APPLED THERETO FOR ROTATION ABOUT A HORIZONTAL AXIS, AND IN SLOWLY ROTATING THE ASSEMBLED DISC AND SHEETS AS A UNIT ABOVE AN ADHESIVE BATH WITH ONLY THE LOWERMOST PORTIONS OF THE FILTER SHEETS ON EACH DIPPED THEREINTO TO THEREBY UNITE THE PERIPHERAL PORTIONS OF THE SHEETS AND SIMULTANEOUSLY APPLY A SEALING COAT THEREOVER.