Patent drop reveals pressures on industry.
Lawrence
Stacy
S
D001709:Biotechnology / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data* / Q000639:trends*; D004345:Drug Industry / Q000706:statistics & numerical data* / Q000639:trends*; D010330:Patents as Topic / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data*; D014481:United States