| LIGHTING DEVICE TECHNOLOGIES CORP. Patent applications |
| Patent application number | Title | Published |
|---|
| 20110175516 | BULB SHELL FOR LED LIGHT BULBS - A bulb shell includes a transparent shell base having an opening, a largest outer diameter and a light projection surface defined by a critical boundary on the shell base, and a coating on the shell base in a region between the opening and the critical boundary to increase brightness of the light projection surface. The critical boundary lies between a first position where the largest outer diameter is located and a second position distant from the first position by 33% of the dimension of the largest outer diameter in a direction away from the opening. The coating will significantly increase the brightness of the light projection surface when the bulb shell is used in a LED light bulb. | 07-21-2011 |
| 20100283406 | BI-DIRECTION CONSTANT CURRENT DEVICE - An LED lamp includes a bi-direction constant current device coupled between a power supply and a LED load to provide stable positive and negative currents to the LED load. The bi-direction constant current device includes a pair of current sources face-to-face or back-to-back connected in series between the power supply and the LED load, and two protective elements shunt to the pair of current sources, respectively. | 11-11-2010 |
