482. Prior art.

The philosophy behind the doctrine of obviousness is that the public should not be prevented from doing anything which was merely an obvious extension or workshop variation of what was already known at the priority date. The skilled person is, therefore, treated as having access to every example of prior art and must be considered as sufficiently interested in the information, which he is deemed to have, to consider its practical application whether or not he would have done so in practice1.

The fact that a document is old does not, per se, mean that it cannot be the basis