Condensed Consolidated Balance Sheets - USD ($)	Oct. 31, 2022	Jul. 31, 2022
Current assets
Cash and cash equivalents	$ 2,452,000	$ 3,391,000
Accounts receivable	252,000	201,000
Inventories, net	239,000	179,000
Restricted cash	75,000	75,000
Prepaid expenses	54,000	18,000
Total current assets	3,072,000	3,864,000
Property, plant and equipment, net	627,000	620,000
Total assets	3,699,000	4,484,000
Current liabilities
Accounts payable	561,000	488,000
Accrued liabilities	138,000	87,000
Total current liabilities	699,000	575,000
Total liabilities	699,000	575,000
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.01 par value: 5,000,000 shares authorized, no shares issued and outstanding
Common stock, $0.01 par value: 150,000,000 shares authorized, 111,356,473 shares issued and outstanding at October 31, 2022 and at July 31, 2022	1,114,000	1,114,000
Additional paid-in capital	132,163,000	132,079,000
Accumulated deficit	(130,277,000)	(129,284,000)
Total stockholders’ equity	3,000,000	3,909,000
Total liabilities and stockholders’ equity	$ 3,699,000	$ 4,484,000