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Intangible Assets, net | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, net | 11. Intangible Assets, net Intangible assets as of December 31, 2021 and 2022 consisted of the followings:
|  | December 31, 2021 |  |  | December 31, 2022 |
Computer software at cost |  | $ | 108,560 |  |  | $ | 104,211 |
Sewage discharge permit* |  |  | 1,915,740 |  |  |  | 1,762,129 |
|  |  | 2,024,300 |  |  |  | 1,866,340 |
Accumulated amortization |  |  | (62,561 | ) |  |  | (557,282 | )
|  | $ | 1,961,739 |  |  | $ | 1,309,058 |
Amortization expenses were $41,132 and $513,311 for the years ended December 31, 2021 and 2022, respectively.
* | The Company had not yet obtained the ownership of sewage discharge permit in its Zhejiang manufacturing facilities with a carrying amount of $1,873,168 as of December 31, 2021. The sewage discharge permit was registered under the name of New Era (note 12). The Company has obtained a five years sewage discharge permit on January 27, 2022.
Total future amortization expenses for finite-lived intangible assets were estimated as follows:
2023 |  | $ | 482,159 |
2024 |  |  | 480,805 |
2025 |  |  | 320,761 |
2026 |  |  | 6,042 |
2027 |  |  | 4,528 |
Thereafter |  |  | 14,763 |
Total |  | $ | 1,309,058 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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