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 | Company History |
| 1867 | - | Thomas Donovan established a ship supply company in Saint John, New Brunswick. |
| 1950 | - | T. Donovan is purchased and reorganised by son Gordon D. Cobham as a chemical products company. Their primary business was the analysis and treatment of circulating boiler systems. T. Donovan was the first manufacturer of steam plant chemicals in the Maritimes. |  |
| 1970 | - | Ownership and management of T. Donovan assumed by Gordon R. Cobham, son of Gordon D. Cobham. |
| 1972 | - | Introduction of Industrial cleaning products. |
| 1984 | - | Launched a division with a product line for cleaning and sanitizing in health care, food processing and hospitality industries. |
| 1997 | - | The Water Treatment and industrial Cleaning segment of the Business was sold to Dave Page and Judy Brewster, former employees. They continue the business as T. Donovan & Son (1997) Ltd. |
| 2018 | - | T. Donovan & Son (1997) Ltd. was purchased by former employee, Lee Keenan & his wife Kimberly Keenan. They continue the business as T. Donovan & Son (1997) Ltd., which is the largest independent supplier of industrial water treatment products in Atlantic Canada. |