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INTANGIBLE ASSETS
12 Months Ended
Jun. 30, 2019
INTANGIBLE ASSETS [Abstract]  
INTANGIBLE ASSETS
7.
INTANGIBLE ASSETS

Intangible assets consist of the following as of the dates presented:

  

 
June 30,
  
December 31,
  
Weighted
Average
Remaining
Amortization
Period
 
  2019  2018  
2017
  
(in Years)
Patents
 
$
1,007,497
  
$
969,632
  
$
958,604
   
15.0
 
Trademarks
  
100,331
   
73,877
   
57,325
   
9.5
 
License rights
  
6,718
   
6,718
   
6,718
   
-
 
Total
  
1,114,546
   
1,050,227
   
1,022,647
     
Less accumulated amortization
  
(1,017,173
)
  
(1,015,394
)
  
(1,014,050
)
    
Intangible assets, net
 $
97,373
  
$
34,833
  
$
8,597
     

Amortization expense for the fiscal year ended June 30, 2019, the transition period ended June 30, 2018 and the calendar year ended December 31, 2017 was approximately $2,000, $1,000 and $2,000, respectively. Amortization expense on existing intangible assets is estimated to be approximately $9,000 for each of the fiscal years ending June 30, 2020, 2021 and 2022 and $8,000 for each of the fiscal years ending June 30, 2023 and 2024. The amortization expense for the remaining unamortized balance of the total intangible assets, net, will be recognized in fiscal years ending after June 30, 2024.