In contrast, few lawyers specialize exclusively in defensive tactics like invalidation, reexamination and joint defense.

FORBES: Turn The Tables On Patent Trolls

In both cases, companies have been threatened with the invalidation of patents in the name of public health.

FORBES: Magazine Article

But here's the strange thing: the invalidation of Heritage's job predictions has had no impact whatsoever on Republican advocacy of the Ryan plan.

CNN: Both parties abandon the jobless

He cautioned in the Lawrence case that it had nothing to do with gay marriage, but dissenting Justice Antonin Scalia predicted the decision would lead to the invalidation of state laws against same-sex marriage.

NPR: Calif. Gay Marriage Argument At High Court Tuesday