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Intangible Assets, Net
9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
6. Intangible Assets, Net

Intangible assets, net consisted of the following at September 30, 2020 and December 31, 2019: 


   September 30, 2020   December 31, 2019 
   (unaudited)         
   Gross
Carrying
Amount
   Accumulated
Amortization
   Net
Carrying
Amount
   Gross
Carrying
Amount
   Accumulated
Amortization
   Net
Carrying
Amount
 
Patents  $50,000   $(28,125)  $21,875   $50,000   $(26,250)  $23,750 
Trade names, trademarks product names, URLs   555,000    (488,104)   66,896    555,000    (446,479)   108,521 
Internally developed software   1,990,000    (1,983,405)   6,595    1,990,000    (1,959,655)   30,345 
Subscriber/customer relationships   2,279,000    (1,938,725)   340,275    2,279,000    (1,813,725)   465,275 
Total intangible assets  $4,874,000   $(4,438,359)  $435,641   $4,874,000   $(4,246,109)  $627,891 

Amortization expense for the three and nine months ended September 30, 2020 was $64,083 and $192,250, respectively, as compared to $64,084 and $192,249 for the three and nine months ended September 30, 2019, respectively. The aggregate amortization expense for each of the next five years and thereafter is estimated to be $54,431 in 2020, $184,667 in 2021, $149,944 in 2022, $18,000 in 2023, $17,354 in 2024 and $11,245 thereafter.