Method for making a mold

Claim 1

IN THE METHOD OF MOLDING A PLASTIC ARTICLE, THE STEPS OF FIRST SHAPING A MASTER WOOD FORM AND SMOOTHING A SURFACE THEREOF CONFORMING TO THE GENERAL CONTOUR DESIRED FOR SAID ARTICLE, THEN CEMENTING AND FIRMLY PRESSING CLOSELY TO SAID SURFACE A FLEXIBLE COVER SHEET TO PREVENT THE GRAIN PATTERN OF THE WOOD OF SAID FORM FROM BEING IMPRESSED INTO A MOLD BY RAISING OF SAID PATTERN IN CONSEQUENCE OF THE EXOTHERMIC CURING REACTIN OF AN INCOMPLETELY CURED MOLD FORMING THERMOSETTING REIN TO BE SUBSEQUENTLY CURED ON SAID SHEET IN THE FORMATION OF A MOLD THEREON, COATING SAID SHEET WITH A PARTIN AGENT, FORMING SAID MOLD ON SAID COVER SHEET BY COATING THE SAME OVER SAID PARTING AGENT WITH SAID INCOMPLETELY CURED RESIN, SUBSTANTIALLY CURING SAID MOLD ON SAID FORM AND COVER SHEET TO PRESERVE A REVERSAL OF THE CONTOUR OF SAID COVER SHEET IN THE SURFACE OF SAID MOLD CONFRONTING SAID COVER SHEET, REMOVING SAID MOLD FROM SAID COVER SHEET AND FORM, COATING THE REVERSAL OF SAID CONTOUR ON SAID MOLD WITH A PARTING AGENT, FORMING SAID ARTICLE BY APPLYING A RESIN OVER THE PARTING AGENT ON SAID MOLD, AND ALLOWING THE LATTER RESIN TO HARDEN ON SAID MOLD.