The defendants can ______ for revocation of the patent in highcourtOptionsSubordinate claimAll of the abovecounter claimMain claim

In the context of a legal dispute over a patent, the correct option that completes the sentence "The defendants can ______ for revocation of the patent in high court" would typically be "counter claim."

Explanation

1. Subordinate Claim: This usually refers to a claim that is secondary or dependent on a primary claim. It wouldn't be the primary approach for revocation.

2. Counter Claim: This is a legal term that refers to a claim made to offset another claim. In patent law, defendants may file a counterclaim seeking the revocation of the plaintiff's patent.

3. Main Claim: This usually refers to the primary assertion made in a legal case. It is less about revocation and more about the initial claim.

4. All of the above: This option is not applicable because not all options support the action for revocation.

Thus, the most appropriate choice is "counter claim," as it represents the legal framework through which defendants can seek revocation of a patent in response to a patent infringement suit.