Mason jar (U.S. patent no. 22,186.) From when it was first patented Mason jars have had hundreds of variations in shape and cap design. After Mason's patent expired, many other manufacturers produced glass jars for home canning using the Mason-style jar.

The initial form of closure for the glass canning jar was a zinc screw-on cap, the precursor to today's screw-on lids. It usually had a milk-glass liner, but some of the earliest lids may have had transparent glass