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Patents
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Patents
3. Patents
 
Patent intangible assets consisted of the following at December 31, 2016:
 
 
Weighted
 
 
 
 
 
 
 
 
Average
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
 
Useful Life
 
Amount
 
Amortization
 
Amount
 
Amortizable intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
Patents
 
 
5.9
 
$
11,893,745
 
$
(4,734,804)
 
$
7,158,941
 
Total patent intangible assets
 
 
 
 
$
11,893,745
 
$
(4,734,804)
 
$
7,158,941
 
 
Patent intangible assets consisted of the following at December 31, 2015:
 
 
Weighted
 
 
 
 
 
 
 
 
Average
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
 
Useful Life
 
Amount
 
Amortization
 
Amount
 
Amortizable intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
Patents
 
 
6.9
 
$
11,893,745
 
$
(3,223,824)
 
$
8,669,921
 
Total patent intangible assets
 
 
 
 
$
11,893,745
 
$
(3,223,824)
 
$
8,669,921
 
 
The Company expects amortization expense to be approximately $1,510,977 per year for each of the next three years, $1,481,270 in 2020, then declining annual amounts through 2023. However, following the establishment of INVT SPE for the PRIP and the related assignment of the Patents to INVT SPE (see Note 5), patent amortization expense will be eliminated.