It all started in 1967 with a beer called Gablinger's Diet Beer.
Created by biochemist Joseph Owades, it was the first beer to successfully remove starch (and thus calories) during brewing. But the marketing was terrible ("Diet" beer didn't scream "tasty"), and it flopped.
The recipe was passed to Meister Brau, who rebranded it as "Meister Brau Lite." When Miller Brewing Company acquired Meister Brau in 1972, they saw potential—but they needed a nationwide hit.
The Trademark Battle
Miller relaunched the beer as Miller Lite in 1975 using the spelling "L-I-T-E" for a very specific reason: they wanted to trademark it.
They argued that "Lite" was a distinct brand name, not just a description. If successful, no other brewery could use the word "Lite" for their low-calorie beers.
Competitors (like Schlitz and Heileman) were furious. They sued, and the case went all the way to the 7th Circuit Court of Appeals. The judges ruled against Miller, stating that "Lite" was just a phonetic spelling of the generic word "Light" and therefore couldn't be trademarked. One judge famously noted that misspelling a word doesn't make it proprietary.
The Aftermath: Miller lost the exclusive rights (which is why you see Coors Light and Bud Light), but the "Lite" spelling stuck. By then, the ads featuring athletes and "Great Taste, Less Filling" had made "Miller Lite" a household name.
So while they couldn't own the dictionary, they definitely owned the category.