 These papers have been repeatedly cited by later papers and patents.One of their research studies includes "MONOS" (metal-oxide-nitride-oxide-semiconductor) technology,
which used Renesas Electronics' flash memory integrated in single-chip microcontrollers.In 1972, a type of electrically re-programmable non-volatile memory was invented by Fujio Masuoka at Toshiba, who is also known as the inventor of "flash memory".