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PATENTS, NET OF ACCUMULATED AMORTIZATION | 9 Months Ended
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Sep. 30, 2021
Patents Net Of Accumulated Amortization |
PATENTS, NET OF ACCUMULATED AMORTIZATION | 5. PATENTS, NET OF ACCUMULATED AMORTIZATION Acacia’s only identifiable intangible assets as of September 30, 2021 and December 31, 2020 are patents and patent rights. Patent-related accumulated amortization totaled $291.6 million and $319.9 million as of September 30, 2021 and December 31, 2020, respectively. Acacia’s patents have remaining estimated economic useful lives ranging from twenty-six to fifty-two months. The weighted average remaining estimated economic useful life of Acacia’s patents is approximately four years. The following table presents the scheduled annual aggregate amortization expense as of September 30, 2021:
Schedule of intangible assets |  |  |
For the years ending December 31, |  |
(In thousands)
Remainder of 2021 | $ | 2,612 |
2022 |  | 10,448 |
2023 |  | 10,381 |
2024 |  | 9,005 |
2025 |  | 6,630 |
Thereafter |  | 750 |
Patents, net | $ | 39,826 |
For the nine months ended September 30, 2021, Acacia accrued patent and patent rights acquisition costs totaling $13.0 million, of which $8.0 million is due December 1, 2021 and $5.0 million is due February 18, 2023. Such amounts are included in accrued patent investment costs and other long-term liabilities in the consolidated balance sheet as of September 30, 2021, respectively.

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