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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Operating Activities |  |
Net Loss | $ (5,534,340) | $ (7,459,254)
Adjustments to reconcile net loss from operations to net cash used in operating activities: |  |
Common stock issued for services | 45,000 | 17,000
Stock-based compensation | 300,583 | 8,110
Patent write-offs | 0 | 111,850
Changes in operating working capital items: |  |
Other receivables | (110,000) | 400,000
Prepaid expenses and other current assets | (74,751) | (117,281)
Accounts payable and accrued liabilities | 780,425 | 1,465,492
Accrued legal settlement costs | (4,200,000) | 0
Net Cash Used in Operating Activities | (8,793,083) | (5,574,083)
Investing Activities |  |
Patents and trademarks | (16,021) | (138,692)
Net Cash Used in Investing Activities | (16,021) | (138,692)
Financing Activities |  |
Net proceeds from issuances of common stock and exercise of stock options | 3,411,091 | 5,164,685
Net Cash Provided by Financing Activities | 3,411,091 | 5,164,685
Net Decrease in Cash and Cash Equivalents | (5,398,013) | (548,090)
Cash and Cash Equivalents, Beginning of Period | 21,531,665 | 17,958,989
Cash and Cash Equivalents, End of Period | 16,133,652 | 17,410,899
Supplemental Disclosure of Cash Flow Information: |  |
Interest paid | 0 | 0
Income taxes paid | 0 | 0
Non-Cash Financing Activities: |  |
Accumulated preferred stock dividend | 575,049 | 548,637
Conversion of Series A convertible preferred stock to common stock and payment of paid-in-kind dividends to Series A preferred stockholder | 39,885 | 38,071
Payment of accrued liabilities with common stock | $ 69,690 | $ 17,000

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