Time in purgatory
Subtitle: determinants of the grant lag for U.S. patent applications
By: David Popp, Ted Juhl, Daniel K.N. Johnson.
Contributors: Juhl, Ted.; Johnson, Daniel K. N.; National Bureau of Economic Research.
Series: NBER working paper series -- no. 9518.; Working paper series (National Bureau of Economic Research) -- working paper no. 9518.
Publisher: National Bureau of Economic Research
Published: 2003
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 48
Subjects: Patent laws and legislation -- United States; Patents -- United States
Notes: "February 2003."

Includes bibliographical references.

Also available in PDF from the NBER world wide web site (www.nber.org).