submarine patent
n.— «Occasionally, patents take a decade or two to be granted because they are held up in appeals and amendments in the Patent Office. When this happens under the existing system, an inventor can obtain a 17-year monopoly on an invention made long ago and demand payments from companies that have long been using the technology on the assumption that it was not protected by patents. Because these patents remain hidden for a long time and suddenly surface, they have been called “submarine patents.”» —“U.S. Agress to Alter Patents’ Period of Coverage” by Andrew Pollack in Tokyo New York Times Jan. 24, 1994. (source: Double-Tongued Dictionary)
Further reading
David says that when he was growing up in Akron, Ohio, his family referred to the grassy area between the sidewalk and street as the devil strip. He’s since moved to Nashville, Tennessee, where he doesn’t hear that term. There are lots...
Sean in Oneonta, New York, says that when he was growing up in New Jersey, his family would pile in the car and set off on a surprise adventure, whether a short distance or long, and the kids would be told only that they were going on Buxtehude...