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Q48.Recitation in Optional Form

Q48.Recitation in Optional Form
 Are optional expressions permitted in a claim?

A48. If there are expressions where optionally added items are described along with such words as “when desired,” “if necessary,” “preferably,” etc., there are some cases that the statement of the claims is not clear. Further, if there are recitations where numerical ranges include zero, for example, 0 to 10%, such a claim may be unclear since it is unclear as to whether the component concerned should be included or not, i.e., indispensable or optional.