As American consumers seek quality over quantity in their beer, the world’s two biggest brewers are locked in a legal battle over the quest to serve a fresh-tapped taste in every mug.

Anheuser-Busch InBev and Heineken are fighting over who invented key parts of a new way to deliver draft beer that allows for smaller batches and eliminates the need for traditional steel kegs, which use compressed air and can degrade flavor over time.

The companies started the first of two patent-infringement trials on Tuesday over the technology at the U.S. International Trade Commission in Washington. AB InBev says it developed the beer canisters, while Heineken — whose case goes first — says it invented the dispenser equipment. Each is trying to keep the other out of the U.S. market to provide draft beer to smaller pubs and homes.

“The bars used to put in big kegs of Bud Light and Coors Light, and they would sell so much of it that freshness was not an issue,” Sanford Bernstein analyst Trevor Stirling said. “Each individual brand is selling less. Now you need technology to protect the freshness longer even as you’re selling less.”

Analysts say the $120 billion beer industry is getting more fragmented. Americans are drinking less beer, but they are willing to pay for better quality.

The big brewers are struggling to maintain their market share as even craft brews are losing ground to wine and other spirits. The overall volume of beer sales has been declining over the past decade, though dollar sales have increased, according to market researcher Euromonitor International.

“Consumer interest is in the higher end of the product,” said Lester Jones, chief economist for the National Beer Wholesalers Association. “The way to package beer is to make it appear higher end.”

AB InBev — maker of Budweiser and Stella Artois — and Dutch brewer Heineken are looking for new markets in smaller bars or restaurants that don’t want to install big tap systems or by selling home machines that can serve draft beer. That’s led to the legal fights.

The companies had discussed licensing each other’s patents until AB InBev filed its patent case at the trade agency, Heineken lawyer Paul Brinkman of Kirkland & Ellis told trade Judge MaryJoan McNamara in opening arguments Tuesday. AB InBev lawyer Peter Moll of Cadwalader Wickersham & Taft said they were “settlement discussions initiated by Heineken.”

The complaint filed by AB InBev was “not well-received by Heineken” which “pulled a single patent out of its quiver” in retaliation, Brinkman told the judge. He spent much of his opening arguments explaining the history of keg dispenser developments and rebutting AB InBev’s arguments that the patent is invalid. Moll presented his opening arguments outside of the public record because it involved AB InBev’s confidential business information.

Beer is usually served in bottles, cans or the large steel kegs that aficionados say provide the freshest flavor. On the downside, the kegs take up a lot of room and require gas to force the beer out, which can affect the taste over time.

The new “kegs” are slimmer, sealed canisters in which the beer is kept in a bag and air is forced between the outer canister and inner bag, compressing the bag and pushing the beer up from the bottom. Since no air touches the beer, there’s no change in the flavor, and there’s no leftover beer in the keg.

Heineken sells its namesake beer in a stand-alone keg called the Blade while AB InBev sells Stella Artois in its Nova system. Smaller versions of the canisters, holding four pints, are sold for home use. Heineken has a machine it calls Sub that’s sold under an agreement with closely held Hopsy.

AB InBev, the world’s largest beer-maker, says it owns patents on those canisters, and is seeking to block imports of Heineken’s Sub and Blade systems. Brinkman told the judge that Heineken has suspended plans to import the Blade into the U.S. and that the Subs shouldn’t be subject to an import ban, though that case is before a different trade judge.

Heineken says it invented the machinery used in the AB InBev Nova system, particularly the dispensing line that’s designed to be more sanitary and require less maintenance than those in traditional keg systems.

AB InBev promotes Nova as something for “more intimate bars and restaurants that wish to serve proper draught beer without investing in full-scale tap systems.” Heineken says the Blade system has a “small footprint and innovative compression system” that “allows you to serve premium draught beer from any counter top.”

Restaurants and bars are the biggest source of beer sales, according to the Beer Institute, so the countertop systems could open new draft markets to the brand companies. The market for the home draft system is still small, and the European counterpart “hasn’t really taken off,” Stirling said.

Under the deal with Heineken, Hopsy offers a beer club from which consumers can get Sub minikegs from well-known brands like Heineken, Yuengling and Dos Equis or small breweries, including the Blue Nose Brewery in Hodgkins, Illinois; Epidemic Ales in Concord, California; and Bronx Brewery in New York.

“The technology is not being developed by big brewers to strangle craft beer, but if it succeeds it would help them,” Stirling said. “If you could have draft beer on tap at home, could you potentially increase sales?”

In their legal filings, AB InBev and Heineken touted their long pedigrees and history of innovation. Heineken, founded in 1864, bragged that it was the first beer imported into the U.S. after Prohibition was lifted. AB InBev, an amalgam of beer-makers, says its “dedication to producing and selling quality malt beverage products dates back hundreds of years.”

The U.S. patent battle is a new wave after a decade-old dispute in Europe. In 2007, Heineken and InBev settled a European patent battle over InBev’s PerfectDraft home systems. Meanwhile, Danish brewer Carlsberg unsuccessfully sought to have Heineken’s European patent canceled in 2010.

The battle will be decided at the ITC, a quasijudicial agency set up to protect U.S. markets from unfair trade practices, including the infringement of patents.

Heineken’s case against AB InBev is being heard first, with a trial expected to last through April 23. AB InBev’s complaint is scheduled to be heard before a different judge, starting May 6. The judges are scheduled to issue their findings in September, with final decisions from the commission in January.

“These two brewing companies are going to knock heads and get in each other’s way,” said Jones, of the Wholesaler’s Association. “New packages have become very important, and it gets people’s competitive juices forming.”

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