Dating atlas fruit jars
Among the earliest glass jars used for home canning were wax sealers, named in reference to the sealing wax that was poured into a channel around the lip to secure a tin lid.This process, which was complicated and error-prone, became popular in the late 1830s or early 1840s and was commonly used for sealing fruit jars from the early 1850s until about 1890.The band, when screwed down, presses a separate stamped tin-plated steel disc-shaped lid against the jar's rim.An integral rubber ring on the underside of the lid creates a hermetic seal.The bail-style jars are still widely used in Western Europe, particularly France and Italy, where the two largest manufacturers (France's Le Parfait and Italy's Bormioli Rocco) produce the Le Parfait and Fido brands, respectively.While bail-type jars are widely available in the United States, they are generally marketed there exclusively for dry storage and only rarely used for home canning.Between 18, many other patents were issued for Mason jar improvements and closures.
Within a short time he sold the patent rights to several individuals, including Henry Putnam and Karl Hutter. De Quillfeldt used the term "Lightning" to refer to the sealing method, but the closure's popular use on fruit jars led to the name, Lightning fruit jar.The court acknowledged that Mason had invented the jar in 1859, but he did not apply for a patent for an improved version of the fruit jar until 1868.In the meantime, several others had patented designs and Mason had known these jars were being produced and sold.The stopper or lid was typically made from metal, porcelain, or ceramic, while a rubber gasket was used to seal the container. The sealing surface on the jar was a "shelf" that supported the lower edge of the lid.Putnam modified de Quillfeldt's design so that the lid was secured by centering the wire bail between two raised dots or in a groove along the lid's center. A rubber gasket between the shelf and the bottom surface of the lid formed a secure seal when the wire closure was tightened.
An improper or failed seal or microbial growth will cause the dome to pop upward.