Consolidated Balance Sheets (USD $)	Apr. 30, 2012	Jul. 31, 2011
Assets
Cash and cash equivalents	$ 289,000	$ 1,794,000
Accounts receivable, net	193,000	50,000
Inventories, net	901,000	861,000
Prepaid expenses	432,000	100,000
Total current assets	1,815,000	2,805,000
Property, plant and equipment, net	291,000	426,000
Patents, net	1,951,000	1,917,000
Total assets	4,057,000	5,148,000
Liabilities and stockholders' equity
Accounts payable	1,875,000	677,000
Accrued liabilities	409,000	258,000
Total current liabilities	2,284,000	935,000
Deferred rent	3,000	6,000
Total liabilities	2,287,000	941,000
Commitments and contingencies
Stockholders' equity
Preferred stock, $.01 par value: 5,000,000 shares authorized, no shares issued	0	0
Common stock, $0.01 par value: 100,000,000 shares authorized 48,057,074 issued and outstanding at April 30, 2012, and 40,034,659 issued and outstanding at July 31, 2011	480,000	400,000
Additional paid-in capital	61,283,000	57,417,000
Accumulated deficit	(59,993,000)	(53,610,000)
Total stockholders' equity	1,770,000	4,207,000
Total liabilities and stockholders' equity	$ 4,057,000	$ 5,148,000