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Note 9 - Patents
6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Goodwill and Intangible Assets Disclosure [Text Block]
 NOTE 
9
 — PATENTS
 
Patents at
June 30, 2018
and
December 31, 2017
are comprised of the following:
 
   
2018
   
2017
 
   
Cost
   
Accumulated Amortization
   
Net
   
Cost
   
Accumulated Amortization
   
Net
 
Patents-foundation intellectual property
  $
1,377,863
    $
(817,235
)   $
560,628
    $
1,377,863
    $
(787,821
)   $
590,042
 
Epidural-APAD acquired patents
   
2,639,646
     
(879,882
)    
1,759,764
     
2,639,647
     
(439,941
)    
2,199,706
 
Total
  $
4,017,509
    $
(1,697,117
)   $
2,320,392
    $
4,017,510
    $
(1,227,762
)   $
2,789,748
 
 
Patents are amortized utilizing the straight-line method over estimated useful lives ranging from
3
 to
20
years.
 
Amortization expense was
$231,990
and
$17,682
for the
three
months ended
June 30, 2018
and
2017,
respectively. Amortization expense was
$469,356
and
$35,364
for the
six
months ended
June 30, 2018
and
2017,
respectively. The annual amortization expense expected to be recorded for existing intangibles assets for the next
five
years from the balance sheet date of
June 30, 2018
are approximately:
$920,000,
$919,000,
$39,000,
$39,000
and
$29,000,
respectively.