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Information storage and retrieval systems --- Business information services --- Competition

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The goal is to tackle anew the main problems encountered in using patent data in economic research, namely, the large variance in the value of patents, and the difficulties in matching patents with economic categories. The first is addressed with the aid of patent citations, the second with computerized search techniques for large databases. The proposed solutions are applied to the case of Computed Tomography (CT) Scanners, a pathbreaking innovation in medical technology. The main findings are that patents weighted by citations are highly correlated with the value of innovations, and that important innovations generate further innovative activity (R & D), and hence bring about down-the-line patents.

Patents. --- Technological innovations. --- Information storage and retrieval systems --- Patent documentation.

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Information storage and retrieval systems --- Business --- Data processing --- Information storage and retrieval systems - Business --- Business - Data processing

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Patents --- Data processing --- ON-LINE BIBLIOGRAPHIC SEARCHING --- INFORMATION STORAGE AND RETRIEVAL SYSTEMS --- TRADEMARKS --- PATENTS --- DATABASES

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Limnology --- Information storage and retrieval systems --- Computer programs. --- Marine sciences. --- Great Lakes Environmental Research Laboratory --- Databases