Method for fabrication of plastic footwear

Claim 1

A METHOD OF MANUFACTURING SLIPPERS OF HEAT SEALABLE SYNTHETIC POLYMERIC SHEETING MATERIAL, COMPRISING: ADVANCING A FIRST ELONGATED STRIP OF SAID MATERIAL IN A LONGITUDINAL DIRECTION THROUGH A FOOT-OPENING FORMING OPERATION; FORMING FOOT-OPENINGS AT EQUALLY SPACED DISTANCES ALONG SAID STRIP; SUBSEQUENTLY BRINGING SAID FIRST STRIPAND A SECOND STRIP OF SAID MATERIAL INTO FACE TO FACE CONTACT WITH ONE ANOTHER; ADVANCING SAID FIRST AND SECOND STRIPS TOGETHER THROUGH A CUTTING AND SEALING OPERATION BY PUSHING SAID STRIPS TOWARD SAID OPERATION FROM ONE SIDE THEREOF AND PULLING OR WITHDRAWING SAID STRIPS FROM THE OTHER SIDE OF SAID OPERATION, SAID PUSHING AND PULLING BEING PERFORMED WITH EQUAL FORCE, OVER EQUAL DISTANCES AND AT THE SAME TIME; DURING SAID CUTTING AND SEALING OPERATION, EXERTING FIRM PRESSURE ON THE EXPOSED FACES OF BOTH OF SAID STRIPS IN AT LEAST ONE NARROW REGION SURROUNDING ONE OF SAID FOOT-OPENINGS, SAID REGION BEING SPACED OUTWARDLY FROM SAID ONE FOOT-OPENING AND HAVING AN OUTLINE GENERALLY CONFORMABLE TO THE HUMAN FOOT; RAISING THE TEMPERATURE OF SAID STRIPS WITHIN SAID REGION TO THE TEMPERATURE AT WHICH SAID STRIPS WILL COALESCE WITH ONE ANOTHER WITHIN SAID REGION; MAINTAINING SAID TEMPERATURE UNTIL SAID STRIPS ARE PERMANENTLY BONDED IN SAID REGION; AND SEPARATING A COMPLETED SLIPPER FROM THE MATERIAL LYING OUTSIDE OF SAID REGION.

Claim 2

A METHOD OF MANUFACTURING SLIPPERS OF HEAT SEALABLE SYNTHETIC POLYMERIC SHEETING MATERIAL, COMPRISING: ADVANCING A FIRST ELONGATED STRIP OF SAID MATERIAL IN A LONGITUDINAL DIRECTION THROUGH A FOOT-OPENING FORMING OPERATION; FORMING FOOT-OPENINGS AT EQUALLY SPACED DISTANCES ALONG SAID STRIP; SUBSEQUENTLY BRINGING SAID FIRST STRIPAND A SECOND STRIP OF SAID MATERIAL INTO FACE TO FACE CONTACT WITH ONE ANOTHER; ADVANCING SAID FIRST AND SECOND STRIPS TOGETHER THROUGH A CUTTING AND SEALING OPERATION BY PUSHING SAID STRIPS TOWARD SAID OPERATION FROM ONE SIDE THEREOF AND PULLING OR WITHDRAWING SAID STRIPS FROM THE OTHER SIDE OF SAID OPERATION, SAID PUSHING AND PULLING BEING PERFORMED WITH EQUAL FORCE, OVER EQUAL DISTANCES AND AT THE SAME TIME; DURING SAID CUTTING AND SEALING OPERATION, EXERTING FIRM PRESSURE ON THE EXPOSED FACES OF BOTH OF SAID STRIPS IN AT LEAST ONE NARROW REGION SURROUNDING ONE OF SAID FOOT-OPENINGS, SAID REGION BEING SPACED OUTWARDLY FROM SAID ONE FOOT-OPENING AND HAVING AN OUTLINE GENERALLY CONFORMABLE TO THE HUMAN FOOT; RAISING THE TEMPERATURE OF SAID STRIPS WITHIN SAID REGION TO THE TEMPERATURE AT WHICH SAID STRIPS WILL COALESCE WITH ONE ANOTHER WITHIN SAID REGION; MAINTAINING SAID TEMPERATURE UNTIL SAID STRIPS ARE PERMANENTLY BONDED IN SAID REGION; AND SEPARATING A COMPLETED SLIPPER FROM THE MATERIAL LYING OUTSIDE OF SAID REGION.