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In the law of Patents, the presence of two pending applications, or an existing patent and a pending application that encompass an identical invention or discovery.

When interference exists, the Patent and Trademark Office conducts an investigation to ascertain the priority of invention between the conflicting applications, or the application and the patent. A patent is customarily granted to the earlier invention.

References in periodicals archive ?
As light bounces off each of these layers, the waves experience constructive interference: They combine to produce a wave with a larger amplitude, or peak height.
When the diffracted waves meet again, those that are in step with each other will undergo constructive interference, resulting in a bright fringe, while those that are half a step out of phase will undergo destructive interference, resulting in a dark fringe that can be used to delineate an otherwise invisible edge.
Constructive interference creates a moving pulse along the axis of the apparatus whose speed varies according to the configuration of the experiment.
Constructive interference in steady state (CISS) imaging demonstrated eccentric hypointense foci involving the cyst, which were also suggestive of a scolex (figure 2, C).
(5) Other sequences reported to be useful include three-dimensional (3D) spoiled gradient recalled echo (SPGR)1 and 3D constructive interference in steady state (3D-CISS) which is a heavily T2-weighted high-resolution sequence.

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