What is a result-effective variable in patent law?

A result-effective variable is a parameter that is recognized in the prior art as affecting a particular result or outcome. The concept is important in patent law, particularly in obviousness determinations. According to MPEP 2144.05: “A recognition in the prior art that a property is affected by the variable is sufficient to find the variable…

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What is the “obvious to try” rationale in patent law?

The “obvious to try” rationale is a valid basis for an obviousness rejection in patent law, as clarified by the Supreme Court in KSR International Co. v. Teleflex Inc. According to MPEP 2144.05: “The Supreme Court has clarified that an ‘obvious to try’ line of reasoning may properly support an obviousness rejection. … [W]hen there…

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