What's Happening?
The Federal Circuit has affirmed a district court's decision that certain patent claims by Enviro Tech are indefinite due to the use of the term 'about.' The case involves a patent for treating poultry carcasses with a peracetic acid solution, where the pH
level is described as 'about 7.6 to about 10.' The court found that the term 'about' lacked sufficient precision, as the specification and prosecution history did not provide clear guidance on the permissible deviation from the claimed range. This decision highlights the challenges of using approximation terms in patent claims.
Why It's Important?
This ruling emphasizes the importance of precision in patent claims, particularly when using terms like 'about' that introduce ambiguity. For companies involved in patent litigation, this decision serves as a cautionary tale about the risks of relying on vague language that can render claims indefinite. The case also illustrates the critical role of prior art in determining the validity of patent claims, as the need for clarity is heightened when claims are amended to avoid prior art. This decision could impact how patents are drafted and litigated, especially in industries where precise measurements are crucial.
