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Patent Number 2000-062896, February 29, 2000

granted to Kyo Akio for a “Wine Plug Opener”

solving this problem: “To provide a structure in

which a cork plug can be opened with a light

force even if a person with weak muscle force

opens it irrespective of a main trend in which a

wine plug opener currently available at the

market is operated to pull up and remove the wine

plug.”

Patent Number 2001-080699 March 27, 2001 granted

to Kobayashi Tomoyuki for solving this problem:

“To smoothly perform the insertion work when being

inserted in a cork stopper by providing a screw body

of a wore, wherein the cross section shape of the

whole peripheral shape comprise a protruding surface

section on which a plurality of indented surface

sections are formed in a screw to remove the cork

stopper of wine or the like.”