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Patent Enforcement Delay Now May Be Fatal Error

By Michael Cantor and Pamela Chestek
March 01, 2004

The Lemelson patent era may finally be over. In a decision issued on Jan. 23, a Nevada federal court ruled that a number of patents invented by Jerome H. Lemelson were invalid and unenforceable.

Jerome Lemelson, who died in 1997, was a prolific inventor, second only to Thomas Edison (and Lemelson still has patents pending at the Patent Office). A number of the Lemelson patents, though, are what are called “submarine” patents, patents that a patentee keeps in the application phase for years by filing continuation applications, amending claims over time to more closely describe evolving technology, and allowing the patent to finally issue after the technology has matured and the patent rights will be more lucrative. Since patent applications used to be kept secret indefinitely, there was also no way of knowing whether a patent application had been filed until the patent was actually issued, so there was also no way to avoid infringement.

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