Patent Drafting: Beyond Legal Requirements (Why Commercial Desirability Matters)

While adherence to legal requirements (novelty, clarity, etc.) is important when drafting patent claims, a crucial aspect often overlooked by those without in-house experiences is their commercial desirability. Consider the following case study.

A patent application for a "robotic effector" included the following claims (heavily modified with main novel feature removed for anonymity):

  1. An apparatus comprising:   
        an enclosure applying a constricting force in response to a pressure differential, and
        a mechanism within the enclosure, movable between first and second shapes, configured to move to or maintain the second shape under the constricting force.
  2. The apparatus of claim 1, wherein when the mechanism is in the second shape and under the constricting force, the apparatus becomes jammed.
  3. The apparatus of claim 2, wherein if the jammed apparatus is forced out of the second shape by an external force and the external force is removed, the apparatus returns to the second shape.

While claim 3 might seem specific on the surface, it actually suffers from two key shortcomings:

  • Technical Disadvantage: An ideal effector, at least in view of the objective of providing on-demand rigidity, should ideally be able to maintain its shape while exerting a strong gripping force. Claim 3, however, describes an apparatus that can unintendedly and momentarily yield under excessive pressure, which is not a desirable feature and does not help the claimed invention meet the objective.
  • Lack of Novelty: Even more concerning, this yielding characteristic is not novel. Existing effectors also exhibit this limitation to varying degrees. As such, claim 3 does not add any novelty.

This example highlights the need to carefully consider both legal and commercial aspects during patent claim drafting. By ensuring claims meet legal requirements like novelty and clarity, while also considering their commercial desirability, attorneys can create patents that are both legally compliant and commercially sensible.

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