| By: |
Ganglmair, Bernhard;
Robinson, W. Keith;
Seeligson, Michael |
| Abstract: |
We document the occurrence of process claims in granted U.S. patents over the
last century. Using novel data on the type of independent patent claims, we
show an increase in the annual share of process claims of about 25 percentage
points (from below 10% in 1920). This rise in process intensity is not limited
to a few patent classes but can be observed across a broad spectrum of
technologies. Process intensity varies by applicant type: companies file more
process-intense patents than individuals, and U.S. applicants file more
process-intense patents than foreign applicants. We further show that patents
with higher process intensity are more valuable but are not necessarily cited
more often. Last, process claims are on average shorter than product claims;
but this gap has narrowed since the 1970s. These patterns suggest that the
patent breadth and scope of process-intense patents are overestimated when
claim types are not accounted for. We conclude by describing in detail the
code used to construct the claim-type data, showing results from a
data-validation exercise (using close to 10,000 manually classified patent
claims), and providing guidance for researchers on how to alter the
classification outcome to adapt to researchers' needs. |
| Keywords: |
innovation,patent claims,patents,patent breadth,patent scope,process claims,process intensity,R&D,text analysis |
| JEL: |
C81 O31 O34 Y10 |
| Date: |
2022 |
| URL: |
https://d.repec.org/n?u=RePEc:zbw:zewdip:22011 |