Patent ID: 7358656
Filing Date: 2008-04-15
Classification: H01J,Y02B

Abstract:
1. A low-wattage bi-helical compact fluorescent lamp, comprising a spiral wound tubing formed by two spiral tubes joined at an apex with a first cooling point positioned at a vertex that joins a first left-half spiral tube with a right-half spiral tube of the lamp and a second cooling point positioned proximate to a lamp base; wherein each of said cooling points comprises an enlargement of a spring lamp tube diameter with a cooling point length not exceeding 5 times a tube diameter, wherein the enlargement provides a cooling point chamber that increases a volume of the lamp tube; wherein each cooling point chamber includes a shape of an ellipsoidal convexity, the first cooling point having an ellipsoidal cross-section with its major axis in a vertical position, and the convexity so formed is in a highest upright position; and the second cooling point is positioned at a distal end on the periphery of the left-half portion of the spiral shaped tube and provides a non-symmetrical lamp operation; wherein each of said cooling points affords a mercury vapor condensation to a liquid that is deposited in a cooling point chamber; wherein said cooling points control the mercury vapor pressure at approximately six millitorr.