The Company’s intangible assets consist of Patents, Patent Pending Applications and Customer Contacts.

Provisional patent applications are not amortized until a patent has been granted. Once a patent is granted, the Company will amortize the related costs over the estimated useful life of the patent. If a patent application is denied, then the costs will be expensed at that time.

The customer contacts were acquired in a business acquisition on December 31, 2011 and were to be amortized over their estimated useful life of 3 years.

The following is a summary of definite-life intangible assets less accumulated amortization as of December 31, 2016 and 2015, respectively:

	Year Ended December 31,
	2016		2015


Provisional Patent Applications	$	183,574	$	137,927
Patents		59,701		39,252
Customer Contacts		262,009		262,009
Less: Accumulated Amortization		(278,833)		(271,544)

Net Intangible Assets	$	226,450	$	167,644

Amortization expense on intangible assets was $2,309 and $2,308 for the years ended December 31, 2016 and 2015.

The estimated aggregate amortization expense for each of the succeeding years ending December 31 is as follows:

2017		2,309
2018		2,309
2019		2,309
2020		2,309
Thereafter		18,172

	$	29,717