Method of making cellular structure

Claim 1

THE METHOD OF MAKING A METAL ARTICLE HAVING AT LEAST ONE INTERNAL CHANNEL, WHICH COMPRISES PREPARING A BILLET HAVING A PLURALITY OF INTERNAL LONGITUDINAL CHANNELS DISPOSED IN LATERALLY OVERLAPPING AND ESSENTIALLY PARALLEL RELATION TO ONE ANOTHER AND AT ACUTE ANGLES TO ROLL-ENGAGED SURFACES OF THE BILLET,PROVIDING SAID BILLET ADJACENT EACH LATERAL EDGE WITH A WEAKENING BETWEEN THE SURFACE OF SAID BILLET AND THE CHANNEL ADJACENT SAID LATERAL EDGE, ROLLING THE BILLET WHEREBY TO REDUCE ITS THICKNESS AND THEREBY FORM A STRIP HAVING OVERLAPPING INTERNAL DISCONTINUITIES LOCATED BETWEEN LAYERS OF CONTINUOUS METAL AND WITH THE WEAKENING PROVIDING A RESTRICTED METAL PORTION LOCATED BETWEEN THE CHANNEL ENDS AND ADJACENT STRIP SURFACES, EXERTING FIRST FORCES TO CAUSE A SURFACE METAL LAYER OF THE STRIP TO SEPARATE FROM OTHER PORTIONS THEREOF AT SAID WEAKENING, AND EXERTING SECOND FORCES AT ONE LATERAL EDGE OF SAID LAYER AN THE OTHER LATERAL EDGE OF ANOTHER METAL PORTION OF THE STRIP WHEREBY TO CAUSE THE LAYER AND SAID OTHER PORTION TO MOVE APART AND THE METAL BETWEEN THE DISCONTINUITIES TO FORM SEPTA INTEGRAL WITH SAID LAYER AND OTHER PORTION AND DEFINING AT LEAST ONE INTERNAL LONGITUDINAL CHANNEL IN THE ARTICLE.

Claim 2

THE METHOD OF MAKING A METAL ARTICLE HAVING AT LEAST ONE INTERNAL CHANNEL, WHICH COMPRISES PREPARING A BILLET HAVING A PLURALITY OF INTERNAL LONGITUDINAL CHANNELS DISPOSED IN LATERALLY OVERLAPPING AND ESSENTIALLY PARALLEL RELATION TO ONE ANOTHER AND AT ACUTE ANGLES TO ROLL-ENGAGED SURFACES OF THE BILLET,PROVIDING SAID BILLET ADJACENT EACH LATERAL EDGE WITH A WEAKENING BETWEEN THE SURFACE OF SAID BILLET AND THE CHANNEL ADJACENT SAID LATERAL EDGE, ROLLING THE BILLET WHEREBY TO REDUCE ITS THICKNESS AND THEREBY FORM A STRIP HAVING OVERLAPPING INTERNAL DISCONTINUITIES LOCATED BETWEEN LAYERS OF CONTINUOUS METAL AND WITH THE WEAKENING PROVIDING A RESTRICTED METAL PORTION LOCATED BETWEEN THE CHANNEL ENDS AND ADJACENT STRIP SURFACES, EXERTING FIRST FORCES TO CAUSE A SURFACE METAL LAYER OF THE STRIP TO SEPARATE FROM OTHER PORTIONS THEREOF AT SAID WEAKENING, AND EXERTING SECOND FORCES AT ONE LATERAL EDGE OF SAID LAYER AN THE OTHER LATERAL EDGE OF ANOTHER METAL PORTION OF THE STRIP WHEREBY TO CAUSE THE LAYER AND SAID OTHER PORTION TO MOVE APART AND THE METAL BETWEEN THE DISCONTINUITIES TO FORM SEPTA INTEGRAL WITH SAID LAYER AND OTHER PORTION AND DEFINING AT LEAST ONE INTERNAL LONGITUDINAL CHANNEL IN THE ARTICLE.