It wasn't until the beginning of 1935 that a polymer called "polymer 6-6" was finally produced. Carothers' coworker, Washington University alumnus Julian W. Hill had used a cold drawing method to produce a polyester in 1930.[20] This cold drawing method was later used by Carothers in 1935 to fully develop nylon.[21] The first example of nylon (nylon 6,6) was produced on February 28, 1935, at DuPont's research facility at the DuPont Experimental Station.[3] It had all the desired properties of elasticity and strength.