439. Specification its own dictionary.

439.     Specification its own dictionary.

To a large extent the specification1 is treated as supplying its own dictionary2, that is to say, where it is clear from the body of the specification that the proprietor of a patent has used a term in his claims in a particular sense, it will be interpreted in that sense, even if it is not the ordinary sense of the term3. The question is always what the person skilled in the art would have understood the patentee to be using the language of the claim to mean4