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United States

The first patent issued for a gas cork ejector was to New Yorker Denis Farandatos in

1956. His patent was licensed to British Oxygen Company and design refinements were

made in England for the product known as the Corkmaster. For details on this

development see the section on England.

British Oxygen stopped production of the metal Corkmaster and introduced the plastic

version in 1962. In the section on England, we noted that the Cork-Ace has been seen

with two different New York City company names at the same address on the

instruction sheet: Denis Industries and Neo Valve Products. The activation levers were

marked "Made in England."

Neo Valve then started to produce the Cork-Ace in

the United States. The activation levers were now

marked "Made in U. S. A." The black rings were

knurled (English version was smooth). The lever was

more robust with ridges for better thumb grip.

Gas cylinders private labeled for Denis Industries by Kidde Industries.