2020

2019

Net operating loss carryforwards

$

8,451,214

$

7,291,333

Capitalized expenditures

1,782,185

1,717,025

Research and experimentation credit carryforwards

928,734

898,610

Stock based compensation

2,321,519

2,139,119

Property and Equipment

3,152

2,234

Accrued expenses

18,518

13,660

Inventory allowance

16,497

 —

Deferred rent

 —

492

Gross deferred tax assets

13,521,819

12,062,473

Deferred tax asset valuation allowance

(13,521,819)

(12,062,473)

Net deferred tax assets

$

 —

$

 —