Patent Claims and Patent Scope

53 Pages Posted: 20 Aug 2016

See all articles by Alan C. Marco

Alan C. Marco

Georgia Institute of Technology - School of Public Policy

Joshua D. Sarnoff

DePaul University College of Law

Charles deGrazia


Multiple version iconThere are 2 versions of this paper

Date Written: August 17, 2016


Patent scope is one of the important aspects in the debates over “patent quality.” The purported decrease in patent quality over the past decade or two has supposedly led to granting patents of increased breadth (or “overly broad” patents), decreased clarity, and questionable validity. Such patents allegedly diminish the incentives for innovation due to increased licensing and litigation costs. However, these debates often occur without well-defined measurements of patent scope. This paper explores two very simple metrics for measuring patent scope based on claim language: independent claim length and independent claim count. We validate these measures by showing that they have explanatory power for several correlates of patent scope used in the literature: patent maintenance payments, forward citations, the breadth of patent classes, and novelty. Using these data, we provide the first large-scale analysis of patent scope changes during the examination process. Our results show that narrower claims at publication are associated with a higher probability of grant and a shorter examination process than broader claims. Further, we find that the examination process tends to narrow the scope of patent claims in terms of both claim length and claim count, and that the changes are more significant when the duration of examination is longer.

Keywords: Patents, patent scope, patent claims, patent examination, patent quality, USPTO

JEL Classification: O3, O31, O32, O34, O38

Suggested Citation

Marco, Alan C. and Sarnoff, Joshua D. and deGrazia, Charles, Patent Claims and Patent Scope (August 17, 2016). Available at SSRN: or

Alan C. Marco (Contact Author)

Georgia Institute of Technology - School of Public Policy ( email )

685 Cherry St.
Atlanta, GA 30332-0345
United States

Joshua D. Sarnoff

DePaul University College of Law ( email )

25 E. Jackson Blvd.
Chicago, IL Cook County 60604-2287
United States
312-362-6326 (Phone)

Charles DeGrazia

EMLV ( email )

75--7 (Fax)

Do you have negative results from your research you’d like to share?

Paper statistics

Abstract Views
PlumX Metrics