The first HIV protease inhibitors were invented by researchers working for the pharmaceutical companies of Hoffmann-La Roche Inc., Abbott Laboratories, and Merck & Co., Inc. HIV protease inhibitors are used in the treatment of patients with AIDS and were considered the first breakthrough in over a decade of AIDS research.

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How to patent a medicine(broad spectrum drug)invented by my father?
My father is 81 years old now, could it be done by among his children?