[RESEARCH] Tretinoin/adapalene/tazarotene Short-Contact-Therapy was covered under a patent that just expired in 2019

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https://patents.google.com/patent/US6083963A/en​A method of treating skin damaged by photoaging, comprising the steps of (1) topically applying an effective amount of a retinoid composition to the affected area of a patient's skin; (2) allowing said composition to remain in contact with the skin for a period of from about thirty seconds to about ten minutes; and (3) rinsing said retinoid composition from said affected area.So, until 2019 , nobody could prescribe or use Short-Contact-Therapy since it was covered under a patent.The Europe side of the same patent seems to be active still - https://data.epo.org/publication-server/document?iDocId=2910291&iFormat=0
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Submitted by sandys1