Mason jar

Before Mason French chef Nicolas Appert invented the method of preserving food by enclosing it in sealed containers. 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, though complicated and error-prone, became popular in the late 1830s or early 1840s and was still used to seal fruit jars until about 1890. The wax sealing process was largely the only one available until other sealing methods were developed. John Landis Mason , inventor of the Mason jar In 1858, a Vineland, New Jersey tinsmith named John Landis Mason (1832–1902) invented and patented a screw-threaded glass jar or bottle that became known as the Mason jar (U.S. patent no. 22,186.) 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 liners. Between 1860 and 1900, many other patents were issued for Mason jar improvements and closures. In 1903 Alexander Kerr introduced lids with a permanent rubber seal. His improved design in 1915 used the modern design. Letters of patent issued to Mason on May 10, 1870, for improvements to his fruit-canning jar was determined to be invalid as a result of a patent infringement case brought before the Southern District of New York on June 11, 1874. The court acknowledged that Mason 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 court ruled that Mason's delay in protecting his patent indicated he had abandoned his invention in the intervening years between 1859 and 1868 and had forfeited his patent. The court's decision allowed other manufacturers to patent, produce, and sell glass jars for canning. Design variations Variations of the Mason jar include the "improved Mason," which sealed on a shoulder above the thread instead of below, and the Atlas Strong Shoulder, with a reinforced shoulder area (as the original design was subject to cracks from the stress at the sealing point). A new type of Mason jar known as a "bead" jar was introduced –1915. These continuous screw-thread jars were designed with a bead between the screw threads and the shoulder as a sealing surface. The Ball Corporation's "Perfect Mason" jar, one of the most common jars of this style, was introduced c. 1913 and produced until the mid-20th century. It had several variations, including a square-shaped jar. Ball Corporation brands The Ball Corporation, which once dominated the market as the largest domestic manufacturer of home canning jars, spun off its home-canning business in 1993. In 1939 the company manufactured 54% of all the canning jars made in the US. Ball ceased production of canning jars when its subsidiary, Alltrista, became a separate company in 1993. Ball Corp. acquired certain Kerr assets, including factories, in 1992 and the Kerr brand of glass home canning jars was absorbed into Alltrista in 1996. Alltrista was renamed Jarden Corporation in 2002. Newell Brands acquired Jarden Corporation in 2016. As of 2022, Newell manufactures canning jars under the brand names Ball, Bernardin, Golden Harvest, and Kerr. ==Contemporary jar design==

A complete Mason jar is composed of a tempered glass jar, a flat self-sealing lid, and a metal band. The jars are made with either a wide mouth () or regular mouth () opening. They come in a variety of sizes, from 4 ounces to a gallon. The half-gallon size and larger are not recommended for canning purposes. The most typical sizes used in canning are quart, pint, and half-pint. The jars typically have their brand name embossed on the side, though jars may also have a decorative design such as a quilting pattern or may be completely blank and smooth. Jars may be washed and reused so long as they have no chips or cracks. In the illustration, the left half are wide mouth and the right half are regular mouth. From left to right: wide mouth half-pint, pint, pint, quart, then regular mouth quart, pint, half-pint, quarter-pint. The lids and bands are also shown. The two rightmost jars are quilted. ==Contemporary lid design==

Charles Rood Keeran's 2-piece vacuum seal for Mason jars, became the standard for home-canning. After his company, White Crown Fruit Jar, Keeran developed the Eversharp mechanical pencil. The lids are made of metal with a ring of sealing compound which acts as a gasket against the jar's rim. Lids may not be used more than once. Processed jars should be stored in a manner where the lids are not disturbed and the seals remain intact. The metal screw bands are used to properly align the lids onto the jar, and to hold the lid in place during processing. They should be removed after processing and may be reused many times as long as they are kept rust-free and undented. ==Collecting vintage jars==

The value of a jar is related to its age, rarity, color, and condition. A jar's age and rarity can be determined by the color, shape, mold and production marks of the glass, and the jar's closure. Mason jars usually have a proprietary brand embossed on the jar. Early jars embossed with "Mason's Patent November 28th 1858" that date from the late 1850s to early 1860s closely match the illustrations of Mason's 1858 patents. Mouth-blown (or hand-blown) jars embossed with a version of "Mason's Patent November 28th 1858" were made about 1857 to 1908 and often had a ground lip as well. By 1908 semi-automatic machines manufactured the majority of these jars. Machine-made Mason jars that originated around 1909 have a sealing surface on a bead ledge below the threads. This type of jar dominated the market by the mid to late 1910s. Manufacturers continued to make jars with the beaded seal after the mid-twentieth century. Most antique jars that are not colorless are aqua or "Ball blue," a blue-green shade that was named for the Ball Corporation, a prevalent jar manufacturer. Most mouth-blown Mason jars embossed with some type of 1858 patent date were produced in aqua glass. The Ball brand of Mason jars were manufactured in several colors, but the most common color was the distinctive "Ball blue," which the Ball Corporation used in its jars from about 1910 to 1930. Mason jars with this particular color of glass may be attributed to Ball, since "virtually no other bottle or jar was made in that color." == Other uses ==

Aside from canning, mason jars are also sometimes used as dessert containers. The jars have been used for a variety of household functional and decorative purposes. Mason jars have been turned into items such as oil lanterns, soap dispensers, speakers and vases. == See also ==