Knox Glass Bottle Company
Knox Glass Bottle Company was an American glass manufacturer known chiefly for beer, milk, and medicine bottles produced at plants across the United States.
Last updated August 25, 2026
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Overview
Knox Glass Bottle Company was an American glass manufacturing company headquartered in Knox, Clarion County, Pennsylvania. Its principal business was the production of glass containers, especially bottles used by beverage, dairy, and pharmaceutical customers. The company’s output included beer bottles, milk bottles, and medicine bottles manufactured in a range of standard sizes. Although the business was industrial rather than consumer-facing, its products remain identifiable to bottle collectors through mould numbers and the company’s distinctive letter-in-a-keystone mark on bottle bases. The company was founded by Roy Underwood and operated from 1917 until 1968. During that period, Knox pursued an expansion strategy based on the acquisition of other glassmaking businesses and plants. It ultimately acquired 16 glass companies or facilities in the United States, giving it a substantially broader manufacturing footprint than its original Pennsylvania base. This consolidation reflected the capital-intensive and geographically distributed nature of the American glass-container industry, in which proximity to customers and production capacity were important competitive considerations. Knox’s historical significance is also connected with corporate law. Litigation involving the company and former executive Roy Underwood produced Knox Glass Bottle Company v. Underwood, 89 So.2d 799 (Miss. 1956). The case is cited as an important Mississippi Supreme Court decision because it addressed, in detail, the fiduciary duties owed by corporate directors and officers. Thus, the company’s legacy extends beyond packaging manufacturing into the development of American business-law doctrine. In 1968, Knox Glass Bottle Company was acquired by Glass Container Corporation, ending Knox’s independent operation as a company. Glass Container Corporation later filed for Chapter 11 bankruptcy protection in Delaware in 1999. The available reference material does not establish whether the Knox name continued as an active consumer or industrial brand after the acquisition, nor does it provide detailed information about individual plants, customers, production volumes, or the terms of the acquisition. Knox is therefore best understood today as a defunct American glass-container manufacturer whose surviving bottles and legal history provide the clearest evidence of its former role.
History
Knox Glass Bottle Company was established in 1917 in Knox, Clarion County, Pennsylvania, by Roy Underwood. It became a manufacturer of glass containers for several established packaging markets. Its production was concentrated on bottles, including beer bottles, milk bottles, and medicine bottles made in standard sizes. The company’s containers were marked in ways that allow collectors to identify them: mould numbers and a distinctive letter-in-a-keystone symbol appeared on the bases of its products. Rather than remaining a single-plant regional producer, Knox expanded through acquisitions. During its operating history, which lasted from 1917 through 1968, the company acquired 16 other glassmaking companies or plants in the United States. The available historical account does not identify every acquired facility or provide a complete chronology of those transactions, but the acquisitions indicate a sustained effort to broaden manufacturing capacity and geographic reach within the American glass industry. The company also became associated with a significant corporate-law dispute. Knox Glass Bottle Company v. Underwood, reported at 89 So.2d 799, was litigation between the company and a former executive. The Mississippi Supreme Court’s 1956 ruling is regarded as an important authority because it set out, in considerable detail, the fiduciary responsibilities of corporate directors and officers. The decision gives Knox a place in legal history in addition to its role in American packaging manufacture. In 1968, Glass Container Corporation acquired Knox Glass Bottle Company. This transaction marked the end of Knox’s documented period as an independent operating company. The acquiring corporation later sought Chapter 11 protection in Delaware in 1999. The available sources do not provide sufficient information to determine whether Knox facilities, trademarks, moulds, or product lines survived within the acquiring organization, and no current independent Knox Glass Bottle Company operation is identified.
- 1999
Acquiring company enters Chapter 11
[1]Glass Container Corporation filed a Chapter 11 bankruptcy petition in Delaware.
- 1968
Acquired by Glass Container Corporation
[1]Glass Container Corporation acquired Knox Glass Bottle Company, ending its documented independent operating period.
- 1956
Mississippi Supreme Court fiduciary-duty decision
[1]Knox Glass Bottle Company v. Underwood, 89 So.2d 799, became a notable Mississippi Supreme Court case concerning the fiduciary duties of corporate directors and officers.
- 1951
Death of founder Roy Underwood
[1]Roy Underwood, the company’s founder, died in 1951.
- 1917
Company founded
[1]Roy Underwood founded Knox Glass Bottle Company in Knox, Clarion County, Pennsylvania.
Products and positioning
An industrial American glass-container manufacturer serving beverage, dairy, and pharmaceutical packaging markets.
Beverage containers
Beer bottles
Beer bottles were among Knox Glass Bottle Company’s principal products. They formed part of the company’s broader output of standardized glass containers for beverage customers. Surviving examples may be identified by mould numbers and the company’s letter-in-a-keystone mark on the base.
Dairy containers
Milk bottles
Knox manufactured glass milk bottles for the dairy-packaging market. These bottles represented the company’s role in supplying reusable or returnable-style glass packaging used in the historical distribution of milk. The reference material does not specify particular shapes, capacities, customers, or product names.
Pharmaceutical containers
Medicine bottles
The company produced glass medicine bottles in a variety of standard sizes. This line served pharmaceutical and medicinal-product packaging needs and demonstrates that Knox’s production extended beyond beer and dairy containers. Specific formulations, customers, and branded bottle ranges are not identified in the available sources.
Brand decisions
1968
Sale to Glass Container CorporationM&ABackground
After operating for approximately five decades and acquiring 16 other glassmaking companies or plants, Knox was purchased by Glass Container Corporation.
Action taken
Glass Container Corporation acquired Knox Glass Bottle Company.
Aftermath
The acquisition marked the end of Knox’s documented independent operation. The available sources do not establish how its plants, products, or marks were subsequently managed.
Recent events
- 1999
Glass Container Corporation files for Chapter 11 bankruptcy protection[1]
Bankruptcy
The corporation that had acquired Knox later filed a Chapter 11 bankruptcy petition in Delaware. The available reference does not specify the effect of the filing on Knox-branded assets or facilities.
- 1968
Glass Container Corporation acquires Knox Glass Bottle Company[1]
M&A
Glass Container Corporation acquired Knox Glass Bottle Company after more than five decades of independent operation.
- 1956
Knox Glass Bottle Company v. Underwood addresses fiduciary duties of corporate officers and directors[1]
Lawsuit
A dispute involving Knox Glass Bottle Company and former executive Roy Underwood resulted in a Mississippi Supreme Court decision that examined the fiduciary obligations of corporate directors and officers in detail.
Sources2 sources
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