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The all elements rule or all limitations rule (often written with a hyphen after "all") is a legal test used in US patent law to determine whether a given reference shows that a patent claim [1] lacks the novelty required to be valid. The rule is also applicable to an obviousness analysis. [2]
In United States patent law, the doctrine of inherency holds that, under certain circumstances, prior art may be relied upon not only for what it expressly teaches, but also for what is inherent therein, i.e., what necessarily flows from the express teachings. [1] For a patent claim to be valid, its subject-matter must be novel and non-obvious.
The non-obvious requirement is explained in Beloit Canada Ltd. v. Valmet Oy. Justice Hugessen contrasted the concepts of anticipation and non-obviousness: They are, of course, quite different; obviousness is an attack on a patent based on its lack of inventiveness. The attacker says, in effect, ‘Any fool could have done that’.
In US patent law, non-obviousness is one of the requirements that an invention must meet to qualify for patentability, codified as a part of Patent Act of 1952 as 35 U.S.C. §103. An invention is not obvious if a " person having ordinary skill in the art " (PHOSITA) would not know how to solve the problem at which the invention is directed by ...
What matters is the objective reach of the claim. If the claim extends to what is obvious, it is invalid under §103. One of the ways in which a patent's subject matter can be proved obvious is by noting that there existed at the time of invention a known problem for which there was an obvious solution encompassed by the patent's claims.
Claim charts may also be used to support an argument that a patent claims ineligible subject matter, such as a law of nature or a conventional business practice. The left column of this type of chart is the same as that of the claim charts described above.
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