Fabrication of hollow articles

Claim 1

THE METHOD OF FABRICATING A SEAMLESS HOLLOW ARTICLE HAVING HOLLOW TUBULAR PASSAGES WITHIN A CAVITY THEREOF SAID METHOD COMPRISING (A) FORMING AN ASSEMBLY OF SUPERIMPOSED COMPONENT SHEETS COMPRISING A FIRST SHEET, A SECOND SHEET AND A THIRD SHEET, (B) APPLYING BETWEEN SAID FIRST AND SECOND SHEETS AND FIRST PATTERN OF STOP-WELD MATERIAL DEFINING A DESIRED CONTINUOUS SYSTEM OF TUBULAR PASSAGES, (1) SAID FIRST PATTERN HAVING A FIRST TERMINAL END TERMINATING WITHIN THE CONFINES OF SAID FIRST AND SECOND SHEETS, (2) SAID FIRST PATTERN HAVING A SECOND TERMINAL END ADAPTED TO PROVIDE A FIRST PORT EXTERNALLY OF SAID ARTICLE, (C) PROVIDING THROUGH SAID SECOND SHEET A PERFORATION ADJACENT SAID FIRST TERMINAL END OF SAID FIRST PATTERN OF STOP-WELD MATERIAL, (D) APPLYING BETWEEN SAID SECOND AND THIRD SHEETS A SECOND PATTERN OF STOP-WELD MATERIAL DEFINING A DESIRED CAVITY ADAPTED TO CONTAIN A FLUID UNDER PRESSURE FOR EXPANSION THEREBY, (1) SAID SECOND PATTERN BEING OF A LARGER AREA THAN SAID FIRST PATTERN AND OF A CONFIGURATION TO COMPLETELY ENCOMPASS SAID FIRST PATTERN, (2) SAID SECOND PATTERN HAVING A TERMINAL END ADAPTED TO PROVIDE A SECOND PORT FOR SAID CHAMBER EXTERNALLY OF SAID ARTICLE, (E) WELDING SAID ASSEMBLY OF SHEETS IN THE ADJACENT AREAS THEREOF DEVOID OF SAID STOP-WELD MATERIAL, WHEREBY SAID PERFORATION PROVIDES INTERCOMMUNICATION OF THE AREAS BETWEEN ADJACENT SHEETS DEFINED BY SAID FIRST AND SECOND PATTERNS OF STOP-WELD MATERIAL, (F) PROVIDING AN OPENING THROUGH SAID WELD SHEETS INTO ONE OF SAID FIRST AND SECOND PORTS, AND (G) INFLATING SAID ASSEMBLY BY INJECTING THROUGH SAID OPENING INTO THE UNWELDED PORTIONS OF SAID ASSEMBLY A FLUID PRESSURE OF SUFFICIENT MAGNITUDE TO INFLATE SAID WELDED SHEETS INTO THE DESIRED CROSS-SECTIONAL CONFIGURATION THEREBY FORMING THE DESIRED TUBULAR PASSAGES WITHIN A CAVITY OF SAID ARTICLE.

Claim 2

THE METHOD OF FABRICATING A SEAMLESS HOLLOW ARTICLE HAVING HOLLOW TUBULAR PASSAGES WITHIN A CAVITY THEREOF SAID METHOD COMPRISING (A) FORMING AN ASSEMBLY OF SUPERIMPOSED COMPONENT SHEETS COMPRISING A FIRST SHEET, A SECOND SHEET AND A THIRD SHEET, (B) APPLYING BETWEEN SAID FIRST AND SECOND SHEETS AND FIRST PATTERN OF STOP-WELD MATERIAL DEFINING A DESIRED CONTINUOUS SYSTEM OF TUBULAR PASSAGES, (1) SAID FIRST PATTERN HAVING A FIRST TERMINAL END TERMINATING WITHIN THE CONFINES OF SAID FIRST AND SECOND SHEETS, (2) SAID FIRST PATTERN HAVING A SECOND TERMINAL END ADAPTED TO PROVIDE A FIRST PORT EXTERNALLY OF SAID ARTICLE, (C) PROVIDING THROUGH SAID SECOND SHEET A PERFORATION ADJACENT SAID FIRST TERMINAL END OF SAID FIRST PATTERN OF STOP-WELD MATERIAL, (D) APPLYING BETWEEN SAID SECOND AND THIRD SHEETS A SECOND PATTERN OF STOP-WELD MATERIAL DEFINING A DESIRED CAVITY ADAPTED TO CONTAIN A FLUID UNDER PRESSURE FOR EXPANSION THEREBY, (1) SAID SECOND PATTERN BEING OF A LARGER AREA THAN SAID FIRST PATTERN AND OF A CONFIGURATION TO COMPLETELY ENCOMPASS SAID FIRST PATTERN, (2) SAID SECOND PATTERN HAVING A TERMINAL END ADAPTED TO PROVIDE A SECOND PORT FOR SAID CHAMBER EXTERNALLY OF SAID ARTICLE, (E) WELDING SAID ASSEMBLY OF SHEETS IN THE ADJACENT AREAS THEREOF DEVOID OF SAID STOP-WELD MATERIAL, WHEREBY SAID PERFORATION PROVIDES INTERCOMMUNICATION OF THE AREAS BETWEEN ADJACENT SHEETS DEFINED BY SAID FIRST AND SECOND PATTERNS OF STOP-WELD MATERIAL, (F) PROVIDING AN OPENING THROUGH SAID WELD SHEETS INTO ONE OF SAID FIRST AND SECOND PORTS, AND (G) INFLATING SAID ASSEMBLY BY INJECTING THROUGH SAID OPENING INTO THE UNWELDED PORTIONS OF SAID ASSEMBLY A FLUID PRESSURE OF SUFFICIENT MAGNITUDE TO INFLATE SAID WELDED SHEETS INTO THE DESIRED CROSS-SECTIONAL CONFIGURATION THEREBY FORMING THE DESIRED TUBULAR PASSAGES WITHIN A CAVITY OF SAID ARTICLE.