ATtinys have been available in 8 pin packages for about 2 decades, and in 6 pin packages for 1 decade. What patents are you referring to?
This one in particular:
https://patents.google.com/patent/US5847450A/en
https://www.eetimes.com/microchip-sues-zilog-over-8-pin-micr...
However, it would not shock me if someone were to take a critical look at the validity of Microchip's patents.
Some STM32s are available in WLCSP packages which are 2.5x2.5mm and have 36 pins.
https://electronics.stackexchange.com/questions/144005/wlcsp...
I gave up on the PIC platform quite some time ago.