"Patent" in this case means obvious or apparent. If you show patent dereliction of duty, you are obviously not doing your job.
deliberate or conscious neglect
The best meaning for dereliction is to neglect or be negligent, careless.
Dereliction of duty means failing to do the task you were charged with. Eg. Falling asleep whilst guarding something.
derelictions
A patent case involves copyrighted or patented material. The word patent can also mean the subject matter is obvious on its face.
The escaped convict was found by the police in the nearbyderelict house.
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it is wide open
One type of patent is the design patent, which protects "ornamental characteristics." If the design is sufficiently innovative, it may receive a design patent.
It means it is open and functioning. patent=functional.
"Patent" in medical terms means open, as a vessel. The opposite is "occluded."
it means that you have a gross patent and need a new one