Constant flow rate fuel injection nozzle

Claim 1

IN A NOZZLE HAVING A SWIRL CHAMBER, SAID CHAMBER HAVING A LONGITUDINAL AXIS, SAID CHAMBER BEING BOUNDED BY A WALL CURVED AROUND SAID LONGITUDINAL AXIS TO DEFINE A SUBSTANTIALLY CONICAL SWIRL CHAMBER SURFACE CONCENTRIC WITH RESPECT TO SAID LONGITUDINAL AXIS THE WIDER BASE OF WHICH IS REARWARD IN THE SWIRL CHAMBER, LIQUID PASSAGEWAY OPENING MEANS IN THE REAR OF SAID CHAMBER IN THE REGION OF SAID CONICAL SURFACE AND LATERALLY REMOTE FROM SAID LONGITUDINAL AXIS ADAPTED TO IMPART A SWIRLING MOTION TO A LIQUID ALONG SAID CONICAL SURFACE, SAID PASSAGEWAY OPENING MEANS BEING THE ONLY MEANS FOR SUPPLYING PRESSURIZED LIQUID TO SAID SWIRL CHAMBER, SAID CHAMBER BEING FREE OF MEANS TENDING TO SUBSTANTIALLY DISRUPT THE SWIRLING MOTION IMPARTED TO SAID LIQUID, AN ORIFICE OPENING AT THE FRONT OF SAID CHAMBER CONCENTRIC WITH SAID AXIS, THE IMPROVEMENT COMPRISING AT LEAST ONE EXPOSED INDENTATION IN SAID CONICAL SURFACE BOUNDING SAID SWIRL CHAMBER, SAID INDENTATION BEING DISPOSED FORWARDLY IN SAID CHAMBER WITH RESPECT TO SAID PASSAGEWAY OPENING MEANS, SAID INDENTATION BEING SPACED APART FROM SAID PASSAGEWAY OPENING MEANS AND THE REGION OF THE WALL SURFACE SEPARATING SAID PASSAGEWAY OPENING MEANS AND SAID INDENTATION BEING ITSELF FREE OF INDENTATIONS THEREBY PREVENTING SURFACE CHANNELING BETWEEN SAID PASSAGEWAY OPENING MEANS AND SAID INDENTATION, SAID INDENTATION ALSO BEING SPACED APART FROM SAID ORIFICE TO MAINTAIN THE PERIPHERY OF SAID ORIFICE OPENING FREE OF INDENTATIONS, SAID INDENTATION ADAPTED TO RENDER LIQUID FLOW RATE MORE INDEPENDENT OF VISCOSITY WITHOUT SUBSTANTIAL DISRUPTION OF THE SWIRLING FLOW PATTERN OF SAID LIQUID.