FROM an early age we are taught the importance of fighting fairly. But as the vast number of frivolous patent lawsuits have shown, too many people are rewarded for doing just the opposite.

The onslaught of litigation brought by “patent trolls” — who typically buy up a slew of patents, then sue anyone and everyone who might be using or selling the claimed inventions — has slowed the development of new products, increased costs for businesses and consumers, and clogged our judicial system.

Their business plan is simple: trolls (intellectual-property lawyers use less evocative terms like “non-practicing entities” and “patent-assertion entities”) make money by threatening companies with expensive lawsuits and then using that cudgel, rather than the merits of a case, to extract a financial settlement. In the apt summary of President Obama, who on Tuesday announced a plan to stave off frivolous patent litigation, trolls just want to “hijack somebody else’s idea and see if they can extort some money.”

So far, legislative action against the practice has been meager. In May, Gov. Peter Shumlin, Democrat of Vermont, signed legislation — the first of its kind — that amends the state’s consumer protection laws to empower its attorney general and others to sue patent holders who assert infringement claims against a Vermont business or resident in bad faith. But lawmakers in the remaining 49 states and in Congress, where no less than four bills now sit in various committees, have yet to legislate specifically against patent trolling.