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Abstract
The article complements a 1995 review of Pfizer’s patenting activity, and presents updated information on the company’s major therapeutic areas, key inventors and geographic extent of patent protection. The review observes a continued low level of co-operation with other research organisations, as measured by co-assignees. Other changes in assignee pattern are noted, due to major divestments in the non-pharmaceutical groups. The technology areas of each of the 31 top inventors is analysed in more detail. The Patent Co-operation Treaty continues to be a key mechanism of application, made more popular in recent years by the increase in states party to the Treaty.