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Fee Income	9 Months Ended
Sep. 30, 2021
Fee Income
Fee Income	Note 5. Fee Income Fee income represents amounts earned by the Company under various license and other agreements relating to technology developed by the Company. Higher fee income in the architectural and automotive markets was predominantly from one-time settlements of lawsuits brought by Research Frontiers in 2018 against two licensees for royalty payments due, as well as for a current special government contract in the automotive area. During the first nine months of 2021, four licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 24%, 21%, 12% and 11% of fee income recognized during such period. During the first nine months of 2020, five licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 18%, 17%, 13%. 12% and 12% of fee income recognized during such period. During the three months ended September 30, 2021, three licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 35%, 31% and 17% of fee income recognized during such period. During the three months ended September 30, 2020, six licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 18%, 15%, 12%, 12%, 11%, and 11% of fee income recognized during such period.

Fee Income

9 Months Ended

Sep. 30, 2021

Note 5. Fee Income

Fee income represents amounts earned by the Company under various license and other agreements relating to technology developed by the Company. Higher fee income in the architectural and automotive markets was predominantly from one-time settlements of lawsuits brought by Research Frontiers in 2018 against two licensees for royalty payments due, as well as for a current special government contract in the automotive area.

During the first nine months of 2021, four licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 24%, 21%, 12% and 11% of fee income recognized during such period. During the first nine months of 2020, five licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 18%, 17%, 13%. 12% and 12% of fee income recognized during such period.

During the three months ended September 30, 2021, three licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 35%, 31% and 17% of fee income recognized during such period. During the three months ended September 30, 2020, six licensees accounted for 10% or more of fee income of the Company; these licensees accounted for approximately 18%, 15%, 12%, 12%, 11%, and 11% of fee income recognized during such period.