When the West Bank & Gaza Strip were controlled by Jordan & Egypt between 1948 and 1967, how come the Palestinians did not ask for their own independent state at that time ?

"My guess would be that it was because the Jordanians and the Egyptians treated them like human beings. And they probably felt protected from Israel by the Jordanians and the Egyptians. At least they weren't being expelled from their land by the Jordanians and the Egyptians."

Wrong guess. It was because the Jordanians, Egyptians and other Arab countries were still promising to conquer Israel and "drive the Jews into the sea."

And the Jordanians treated the Palestinians so well that they went to war with each other not long after.