US Patents for "The Zipper"

I've always been curious about who holds a patent for "the zipper" so I decided to do some research about it. My thought was that the zipper is in or on so many things that somebody HAS to be loaded from everybody having to pay to use it.

Wikipedia gave me these patents. But I couldn't view them.

[edit] Patents
25 November 1851 U.S. Patent 8,540 : "Fastening for Garments & c."
29 August 1893 U.S. Patent 504,037 : "Shoe fastening"
29 August 1893 U.S. Patent 504,038 : "Clasp Locker or Unlocker for Shoes"
31 March 1896 U.S. Patent 557,207 : "Fastening for Shoes"
31 March 1896 U.S. Patent 557,208 : "Clasp-Locker for Shoes"
19 April 1913 U.S. Patent 1,060,378 : "Separable fastener"
20 March 1917 U.S. Patent 1,219,881 : "Separable fastener"
22 December 1936 U.S. Patent 2,065,250 : "Slider"

But the story behind "the zipper" is just as fascinating.
http://inventors.about.com/library/weekly/aa082497.htm

But I guess my point in posting this is that the "zipper" as we know it began as something else and evolved through the series of patents into what we now know today basically because of how an inventor chooses to describe their invention through the claims of its usefulness, drawings and specifications.

For example, I would've never thought of a sewing machine as a zipper. But when I think about it, the use of the sewing machine and the zipper as it is known in the present day actually perform the same function - bringing two pieces of fabric together.

Interesting.