Manifold sheets coated with lactone and related chromogenous compounds and reactive phenolics and method of marking

Claim 1

A MANIFOLDING UNIT, COMPRISING: A BASE WEB HAVING ON ONE SIDE A TRANSFER COATING MADE UP OF A FILM-FORMING MATERIAL WHICH IS RUPTURABLE UPON IMPACT AND WHICH CONTAINS AS A FINELY DISPERSED PHASE NUMEROUS CELLS OF A LIQUID VEHICLE, CARRYING DISSOLVED THEREIN A SUBSTITUTED PHENOL HAVING SUBSTITUENT RADICALS SELECTED FROM THE GROUP CONSISTING OF A SINGLE SUBSTITUENT WHICH IS ONE OF THE ALKYL ALLYL, HALO, HALO-SUBSTITUTED ALKYL, CYCLOALKYL, PHENYL, HALOSUBSTITUTED PHENYL, ALKYL-SUBSTITUTED PHENYL, BIPHENYLYL, BENZYL, AND ALPHA-ALKYL-BENZYL RADICALS, OF ANY TWO SUBSTITUENT RADICALS AND OF ANY THREE SUBSTITUENT RADICALS INCLUDED AMONG SAID SINGLE SUBSTITUENTS EXCEPT WHEN TWO OF SAID TWO OR THREE SUBSTITUENT RADICALS ARE IN THE 2,6-POSITIONS RELATIVE TO THE PHENOLIC HYDROXYL GROUP, OF THE TETRAMETHYL AND TETRAHALO RADICALS, OF ANY OF SAID SUBSTITUENT RADICALS AND SAID GROUPS OF TWO, THREE AND FOUR SUBSTITUENT RADICALS WITH A SECOND HYDROXYL RADICAL ALSO ON SAID PHENOL, OF THE PARA-NITRO RADICAL, AND OF THE PENTAMETHYL AND PENTAHALO RADICALS; SAID MANIFOLDING UNIT BEING ADAPTED TO PRODUCE A DARK COLORED MATERIAL, UPON SAID IMPACT AND LOCAL RUPTURE OF SAID COATING WITH RELEASE OF SAID LIQUID VEHICLE INTO CONTACT WITH A CONTIGUOUS SURFACE CARRYING A COLORLESS OR LIGHTLY COLORED CHROMOGENOUS COMPOUND WHICH INCLUDES AS ITS MAJOR FUNCTIONAL ARRANGEMENT THE MOLECULAR STRUCTURE