How old is the Barbie trademark?

The trademark is Mattel, 1958 is the first one. I have 3 all with "patents pending". Wanna buy them? E-bay has vast information regarding barbie. I'm just too lazy to list them LOL. The answer above mine is correct, but the application for the trademark was applied for in 1958. They were produced in 58, and came on market in 59. I have 3 Kens also, they're from 1961, when it was decided Barbie needed a boyfriend.