Pioneers, submariners, or thicket-builders
Subtitle: which firms use continuations in patenting
By: Deepak Hegde, David C. Mowery, Stuart Graham.
Contributors: Mowery, David C.; Graham, Stuart J. H.; National Bureau of Economic Research.
Series: NBER working paper series -- working paper 13153.; Working paper series (National Bureau of Economic Research) -- working paper no. 13153.
Publisher: National Bureau of Economic Research
Published: 2007
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 62
Subjects: Patent extensions -- Mathematical models; Patent laws and legislation -- United States
Notes: "June 2007."

Includes bibliographical references (p. 37-39).

Also available in PDF from the NBER World Wide Web site (www.nber.org).