4. RESEARCH AND OFFICE EQUIPMENT

12 Months Ended

Sep. 30, 2012

Notes to Financial Statements

4. RESEARCH AND OFFICE EQUIPMENT

Research and office equipment at September 30, 2012 and 2011, consists of the following:

		2012			2011
Research equipment	$	3,108,340		$	3,823,816
Furniture and equipment		102,490			116,173
Leasehold improvements		131,910			126,910
		3,342,740			4,066,899
Less:  Accumulated depreciation and amortization		(2,711,792	)		(3,034,018	)
Net research and office equipment	$	630,948		$	1,032,881

Depreciation expense for the years ended September 30, 2012, 2011 and 2010 totaled $447,171, $447,174, and $437,629, respectively. During the years ended September 30, 2012, 2011 and 2010, equipment with a net book value of $9,399, $2,828 and $2,323, respectively, was retired.