In a method of treating a hollow article, a first gas substantially fills the inside of the article. A second gas including electrically charged species is provided on the outside of the article. The two gases are maintained separate from one another. The first gas is maintained is an electrically conductive...http://www.google.co.uk/patents/US5308649?utm_source=gb-gplus-sharePatent US5308649 - Methods for externally treating a container with application of internal bias gas
