William Underwood established a Boston business that packed preserved foods for domestic use and export. Historians commonly cite Underwood as an early experienced canner whose operations helped spread commercial food preservation know-how in the U.S. Over time, firms like his supported a shift toward larger-scale processing for distant markets.
Thomas Kensett and Ezra Daggett received a U.S. patent for preserving food in tin containers. This helped move U.S. food preservation from fragile glass packages toward metal cans that could be shipped and stored more reliably. It is an early marker of commercial canning taking root in the United States.
By the 1840s, oyster canning was established in Baltimore, supported by nearby Chesapeake oyster beds and expanding rail connections. Canning helped oysters travel farther and last longer than raw or pickled products. Baltimore’s growth in canning made it a key regional hub that later expanded into fruits and vegetables seasonally.
Thomas Kensett’s son (also named Thomas Kensett) began processing oysters in Baltimore, helping build the city’s canning industry. Early firms combined waterfront access with rail shipping to move canned products to expanding U.S. markets. This illustrates how canning clustered near ports and transport corridors.
Gail Borden received U.S. Patent No. 15,553 for a vacuum-based method to concentrate and preserve milk. Canned condensed milk reduced spoilage and enabled long-distance distribution without refrigeration. It became an important industrial preserved food, especially during wartime demand.
Ezra J. Warner patented a dedicated tool for opening metal cans. Early cans were tough and often required improvised tools; a specialized opener made canned foods more practical for military and commercial use. Wider household adoption came later, but this was a key step in usability.
During the American Civil War, the Union government ordered condensed milk and other preserved foods for field rations and supply chains. This wartime demand helped expand production capacity and public familiarity with canned goods. Soldiers’ experience with canned products also influenced postwar consumer markets.
S. B. Platt & Co. began operations in 1865 as part of Baltimore’s expanding waterfront canning economy. Facilities like this show how canning became a major industrial employer, tied to harbor access and rail shipping. Many Baltimore plants also canned fruits and vegetables when seafood was out of season.
By 1870, Baltimore had more than 100 oyster packing houses, reflecting the city’s role as a national canning center. Concentrating many plants in one region supported specialized labor, suppliers, and shipping networks. This scale also made issues like spoilage control and sanitation more visible concerns.
A. K. Shriver invented a steam retort (a pressure-cooking vessel for cans) that improved sterilization speed and uniformity. Compared with boiling cans in water for long periods, pressure processing supported larger batches and more reliable results. This helped push canning further toward mechanized, high-volume production.
From late 1895 to late 1896, Samuel Cate Prescott (MIT) and William Lyman Underwood studied why some canned foods spoiled even after heating. They identified heat-resistant bacterial spores and demonstrated safe processing targets (time and temperature) for specific foods. This work helped shift canning from trial-and-error toward a science-based process.
The American Can Company was incorporated in 1901, reflecting consolidation in can manufacturing. Large can makers could standardize containers, invest in machinery, and supply many food processors at scale. This supported rapid growth of industrial canning by lowering container costs and improving supply reliability.
In the late 1800s and early 1900s, “sanitary can” designs reduced or eliminated solder contacting the food by keeping soldered seams external. This design shift helped address concerns about contamination and improved container reliability for mass production. Over the early 20th century, sanitary-style cans displaced older designs in many markets.
The Pure Food and Drug Act was signed into law on June 30, 1906, restricting misleading labels and certain adulterated foods in interstate commerce. For canned foods, the law strengthened expectations for truthful labeling and safer products. It also increased the importance of standardized manufacturing and inspection practices.
The National Canners Association began in 1907, providing a trade organization focused on scientific, technical, and regulatory issues in canning. Its creation reflects how the industry was becoming more organized and professionalized. Coordinated research and guidance helped spread safer, more consistent industrial practices across companies.
By the 1920s, scientific processing controls, pressure retorts, and large can manufacturers had combined to make canning a stable mass-production industry. By about 1930, canned foods were widely used for everyday meals and for feeding growing urban populations, helping reshape year-round diets. The period from 1850 to 1930 ended with canning established as core U.S. industrial food infrastructure.
The Rise of Industrial Canning in the United States (1850-1930)
