Exhibit 4.4
CONFIDENTIAL
PROMISSORY NOTE
Twelve Month Fixed Rate (12%) Convertible Loan
| Loan Amount (Principal): | $100,000 |
| Points: | 4.0 ($4,000 reduced from Principal) |
| Cash-in Amount: | $96,000 |
| Interest: | 1% per month, paid monthly on Principal ($1,000) |
| Kicker: | 10,000 shares restricted common stock – earned upfront |
| Closing Date: Friday, | April 8, 2022 |
| Due Date (Principal): | April 8, 2023 |
| Due Dates (Interest): | Monthly (May 8, 2022 – April 8, 2023) |
| Maturity Date: | April 8, 2023 (principal & last interest payment due) |
| Grace Period (GP) - Interest: | 3 Business Days |
| Penalty after GP - Interest: | $1,000/week, starts on Day 1 post-GP. |
| Grace Period (Principal): | 5 Business Days |
| Penalty after GP - Principal: | $2,000/week, starts on Day 1 post-GP. |
| Default: | If loan unpaid at end of 5-day GP, PBIO is in Default |
| Security: | 200,000 PBIO Shares Held in Escrow at Computershare |
| Voluntary Conversion: | Before Maturity Date, at $2.50/share |
| Mandatory Conversion: | Upon Up-list @ Lower of $2.50/share or Up-list Price |
ACCEPTED BY
| XXXXXX XXXXXXXXX | Date | Richard T. Schumacher | Date | |||
| Accredited Investor | President & CEO |
March 31, 2022.$100k Note