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Intangible assets, net (Tables)

12 Months Ended

Dec. 31, 2021

Intangible assets, net

Schedule of intangible assets, net

​

​	​	​	​	​	​	​
​		December 31,			December 31,
​	​	2021		​	2020
Software	​	$	30,838	​	$	25,957
Land use rights*	​		314,456	​		307,241
Patents	​		4,707,000	​		4,599,000
Subtotal	​		5,052,294	​		4,932,198
Less: Accumulated amortization	​		(4,846,323)	​		(4,268,165)
Intangible assets, net	​	$	205,971	​	$	664,033

*There is no private ownership of land in China. Land is usually owned by the local government and the government grants land use rights for specified terms. The Company acquired land use rights from the local government in December 2002 for period of 50 years. As of December 31, 2021 and 2020, land use rights with net book value of $200,204 and $201,755, respectively, were pledged as collateral for bank loans (Note 12).

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- References

No definition available.

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- Definition

Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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