Envelope for two-way use

Claim 1

AN ENVELOPE FOR TWO-WAY USE, INCLUDING SUBSTANTIALLY RECTANGULAR FRONT AND BACK PANELS INTERCONNECTED ALONG THREE EDGES THEREOF TO PROVIDE A POCKET HAVING AN INSERT OPENING BETWEEN THE REMAINING EDGES OF SAID PANELS, A CLOSURE FLAP HAVING CONNECTION WITH SAID REMAINING EDGE OF THE BACK PANEL, A FIRST FOLD EXTENDING ALONG SAID CONNECTION AND ON WHICH THE CLOSURE FLAP IS FOLDED OVER THE FRONT PANEL TO CLOSE THE INSERT OPENING FOR A FIRST USE OF THE ENVELOPE, A FIRST SEALING MEANS ON THE CLOSURE FLAP FOR SEALING CONTACT WITH THE FRONT PANEL TO RETAIN THE CLOSURE FLAP CLOSED DURING THE FIRST USE, A SECOND LINE OF FOLD EXTENDING ACROSS BOTH PANELS IN SUBSTANTIAL REGESTRY WITH THE FREE EDGE OF THE CLOSURE FLAP, A RETURN ADDRESS AREA ON THE FRONT PANEL IMMEDIATELY BELOW THE SECOND LINE OF FOLD AND HAVING A RETURN ADDRESS LOCATED THEREON DURING SAID FIRST USE OF THE ENVELOPE, SAID ENVELOPE BEING OPENED AFTER THE FIRST USE BY LOOSENING THE CLOSURE FLAP FROM THE FIRST SEALING MEANS, AND GUM ON THE CLOSURE FLAP PROVIDING A SECOND SEALING MEANS FOR THE CLOSURE FLAP WHEN THE ENVELOPE IS FOLDED ON THE SECOND LINE OF FOLD TO BRING THE PORTIONS OF THE PANELS THAT LIE BETWEEN SAID LINES OF FOLD INTO COVERING RELATION WITH THE RETURN ADDRESS AND THE FIRST SEALING MEANS WHEN THE CLOSURE FLAP GUM IS SEALED TO THE FRONT PANEL FOR THE SECOND USE OF THE ENVELOPE.