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4. Property and Equipment (Details) (USD $) | 12 Months Ended | 178 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012
Property And Equipment Details |  |  |
Office equipment | $ 91,288 | $ 75,685 | $ 91,288
Furniture and fixtures | 16,128 | 15,589 | 16,128
Machinery and equipment | 49,986 | 49,986 | 49,986
Testing equipment | 147,312 | 147,312 | 147,312
Property and equipment, gross | 304,714 | 288,572 | 304,714
Less accumulated depreciation | (249,040) | (212,963) | (249,040)
Property and equipment, net | 55,674 | 75,609 | 55,674
Depreciation expense | $ 36,077 | $ 34,717 | $ 530,976

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