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Just because someone has a patent, doesn't mean it's being built or used.But I see the papers about Rail-to-Rail I/O OTA Rail to rail operational transconductance amplifier - Patent 5208552 .
A CA3080 eas the first transconductance amplifier IC. It is obsolete now. Then came the LM13600 then the LM13700.
They were used in the late 60's and early 70's for electric guitar effects. Nobody uses them today.
The very old CA3080 was a single transconductance amplifier. Today you can buy an LM13700 which is a dual transconductance amplifier that is a little different. Digikey has 243 in stock for $2.52US for the DIL package. They have 337 in a surface-mount package for $1.44US each.