Today in 1971, US Patent 3586514 A was issued, an invention of Taco Vijlbrief, assigned to Heineken Tech Beheer NV, for his “Thin-Walled Plastic Container For Beer.” There’s no Abstract, though it’s described this way in the application:

SUMMARY OF THE INVENTION According to the present invention, it has been found that a thin-walled container specially suitable for beer and other oxygen-sensitive materials is obtained by having a hard polymer or copolymer of vinyl chloride containing such a quantity of anti-oxidizing agent that the oxygen permeability of this hard polymer or copolymer, measured as the number of cm. of oxygen of standard temperature and pressure which has passed through 1 cm. of the plastic through a thickness of 1 mm, per second, per cm. of oxygen overpressure at 20 C. (mercury), amounts to about 10- cm. (STP)mm./cm. sec., cm. Hg or lower.

By thin-walled throughout the specification and claims is understood that the thickness of the wall does not exceed 2.5 millimeters. Thicker walls present working difficulties and moreover, the problem of undesired oxygen permeation through the wall is felt only if the wall is thin.

A modern PET Heineken bottle.