This case raises important questions about the reach of American patent law and how much control a manufacturer can exert after its products have been lawfully sold. Taken to their logical conclusion, Lexmark’s arguments would mean that producers could use patent law to dictate how things like computers, printers and other patented goods are used, changed or resold and place restrictions on international trade. That makes no sense, especially in a world where technology products and components are brought and sold numerous times, which is why the court should rule in favor of Impression.

Image Lexmark is suing Impression Products over the use of its printer cartridges. Credit... Sandy Huffaker/Bloomberg News

If technology companies want to restrict how their products are used, they can lease their goods or sign contracts with business customers. Some manufacturers already use contracts to restrict reselling when they want to offer similar products at different prices in different countries. But using patent law to enforce restrictions is fraught with problems. There is no reason patent owners should be allowed to demand royalties from second or third owners of products who may be unaware of any restrictions.

Public-interest groups like Public Knowledge and the Electronic Frontier Foundation and technology companies like Google, Intel and Dell have filed briefs in support of Impression, arguing that patent law should not be used to limit the resale of goods and restrict international trade.

Pharmaceutical and medical device companies have filed briefs supporting Lexmark, arguing that a ruling in favor of Impression would make it easier to import drugs into the United States from countries where their prices are lower. That concern is misplaced, because the Food and Drug Administration has the power to restrict drug imports, and federal law already prohibits the re-importation of medicines made in the United States by anybody other than the producer.

A 2013 Supreme Court decision also appears to support Impression’s position. In Kirtsaeng v. John Wiley & Sons, a 6-to-3 majority said people should be able to import and resell textbooks that were first sold abroad.