''The issuance of a preliminary injunction is an extraordinary remedy to be used only to preserve the existing state of things between the parties. Generally, courts have set forth four requirements for granting a preliminary injunction:

The plaintiff has demonstrated a reasonable likelihood of success on the merits of the case (i.e., that the patent in issue is valid and infringed).
The plaintiff will be irreparably harmed if the injunction is not issued.
The threatened harm to the plaintiff outweighs the harm the injunction may inflict on the defendant.
The injunction will serve the public interest.''

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