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a USPTO registered practitioner (passed the patent bar exam, etc.) who is NOT an attorney.
a defense against an infringement charge. If proven, the patent would destroyed.
Enablement, or sufficiency of disclosure, is the requirement that a patent allows a person skilled in the art to reproduce the claimed invention.
US patent class 435: chemistry: molecular biology and microbiology
US patent class 715: data processing: presentation processing of document, operator interface processing, and screen saver display processing
US patent class 455: telecommunications