Thin film fluid applicator

Claim 1

A FLUID APPLICATOR FOR DEPOSITING A THIN LAYER OF FLUID OF UNIFORM THICKNESS ONTO A PLANAR SURFACE OF A ROTATING SUBSTRATE LYING IN A PLANE HAVING AN APPRECIABLE VERTICAL COMPONENT, COMPRISING: (A) A BODY MEMBER HAVING AN ELONGATED PASSAGEWAY ADAPTED TO TRANSPORT FLUID INTRODUCED THEREIN; (B) AN ELONGATED OUTPUT OPENING COUPLED TO SAID PASSAGEWAY FOR EMITTING SAID FLUID UNDER SUBSTANTIALLY EQUAL PRESSURE ALONG ITS LENGTH; (C) SAID OUTPUT OPENING BEING LOCATED IN A PLANAR SURFACE OF SAID BODY MEMBER; AND POSITIONED IN THE PROXIMITY OF, SUBSTANTIALLY PARALLEL TO, AND IN FACING RELATIONSHIP WITH, SAID SUBSTRATE SURFACE AND GENERALLY ALONG A RADIUS OF SAID ROTATING SUBSTRATE; (D) SAID PNALAR SURFACE FURTHER INCLUDING A PORTION EXTENDING FORWARDLY ALONG THE ENTIRE EXTENT OF, AND FROM, SAID SLOT AND IN THE DIRECTION OF MOVEMENT OF SAID SUBSTRATE; (E) A SURFACE OF SAID BODY MEMBER EXTENDING NORMAL FROM THE LEADING EDGE OF SAID FORWARDLY EXTENDING PORTION AND BEING CONCAVE IN CHARACTER; SUCH THAT SAID LEADING EDGE IS DIMENSIONALLY FURTHEST FROM THE ELONGATED OPENING AT ABOUT THE VICINITY OF THE PERIPHERY OF SAID SUBSTRATE AND DIMENSIONALLY NEAREST TO SAID OPENING AT ABOUT THE VICINITY OF THE CENTER OF ROTATION OF SAID SUBSTRATE.