By Zvi Griliches
"An crucial reference for experts within the economics of technological change."--D. G. McFertridge, Canadian magazine of Economics
Read Online or Download R and D, Patents, and Productivity (National Bureau of Economic Research Conference Report) PDF
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Additional resources for R and D, Patents, and Productivity (National Bureau of Economic Research Conference Report)
Example text
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The vast majority of patents are owned by principal companies. In our earlier sample about 10 percent of total patents were accounted for by patents of subsidiaries. S. S. patents for each firm in our sample. For most of our sample, this ratio is less than 15 percent; the list of firms for which it is larger includes most of the American Deposit Receipts (ADR) firms on the New York Stock Exchange and several other firms clearly identifiable as foreign. After deleting these firms from the sample, as a final check we printed a list of the remaining firms with "ADR" or "LTD" in their names.
However, the latter number may be an overestimate since we know that approximately one-third of all domestic corporate patents remain unmatched in 1976 in our sample, and it is likely that some of these belong to 39 Who Does R&D and Who Patents? subsidiaries of our larger companies which we have overlooked. Further checking of these patents is being done. 3 we show the mean number of patents and number of firms which have one or more patents for each of our twenty-one industry classes. As we expect, patenting is higher in the science-based or technological industries in terms of both the fraction of firms which patent and the average number of patents taken out by the patenting firms.