Borge Madsen filed a patent for the slide fastener, the plastic zipper that makes plastic bags resealable, for the Ziploc® bag on January 27, 1951. The patent was issued on October 14, 1952.

English: A Ziploc plastic bag.

A Ziploc plastic bag. (Photo credit: Wikipedia)

He sold rights to this and a couple of related patents to the Flexigrip company, which used them to make those plastic pockets for pencils in three-ring binders you may remember from school.

But, where they really hit their stride was in small, resealable bags for storing food.

In 1961, Flexigrip licensed a patented plastic zipper bag from a Japanese company, then licensed the rights out for the supermarket market to Dow Chemical in 1964.

Dow renamed the bags Ziploc and started selling them in 1968. They sold the rights to the whole zippered bags for food line, along with some other brands, to S.C. Johnson in 1997 for something between $1.3 and $1.7 billion dollars.

The company’s latest line of 2010 award-winning, Best New Product Awards, “evolved” sandwich and storage bags, are made with wind power.


Carol Covin, Granny-Guru

Author, “Who Gets to Name Grandma? The Wisdom of Mothers and Grandmothers”


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