Consolidated Balance Sheets (USD $)	Jul. 31, 2012	Jul. 31, 2011
Assets
Cash and cash equivalents	$ 877,000	$ 1,794,000
Accounts receivable, net	373,000	50,000
Inventories, net	654,000	861,000
Prepaid expenses	347,000	100,000
Total current assets	2,251,000	2,805,000
Property, plant and equipment, net	257,000	426,000
Patents, net	1,950,000	1,917,000
Total assets	4,458,000	5,148,000
Liabilities and stockholders' equity
Accounts payable	1,946,000	677,000
Loan payable, net	962,000	0
Accrued liabilities	344,000	258,000
Derivative liability	319,000	0
Deferred revenue	66,000	0
Total current liabilities	3,637,000	935,000
Deferred rent	3,000	6,000
Total liabilities	3,640,000	941,000
Stockholders' equity
Preferred stock, $0.01 par value: 5,000,000 shares authorized, no shares issued	0	0
Common stock, $0.01 par value: 100,000,000 shares authorized 6,644,555 issued and outstanding at July 31, 2012, and 5,004,275 issued and outstanding at July 31, 2011.	67,000	50,000
Additional paid-in capital	63,251,000	57,767,000
Accumulated deficit	(62,500,000)	(53,610,000)
Total stockholders' equity	818,000	4,207,000
Total liabilities and stockholders' equity	$ 4,458,000	$ 5,148,000