Patent ID: 6911170

Claim:
Method of making a spray diffuser having a flow chamber, a flow chamber outlet mouthpiece with a narrowed cross-section as compared to the flow chamber, and a transitional area from the flow chamber to the flow chamber outlet mouthpiece and an outlet edge of the mouthpiece, said method comprising: providing a multi-part mold forming hollow spaces corresponding to inner and outer surfaces of flow chamber walls to be formed, flowing manufacturing material into said hollow spaces, and thereafter hardening said material to from a cast diffuser, wherein said providing a multi-part mold includes disposing mold parting planes away from preselected areas of the spray diffuser to be formed, which preselected areas are important for achieving a desired flow of fluids during use of the spray diffuser, thereby obviating a need for precise machining of said preselected areas, wherein said preselected areas comprise the transitional area from the flow chamber to the flow chamber outlet mouthpiece and an outlet edge of the mouthpiece.