http://patft.uspto.gov/netahtml/srchnum.htm (http://patft.uspto.gov/netahtml/srchnum.htm)
http://www.alternatiff.com/ (http://www.alternatiff.com/)
Post 439077 (https://www.thevespiary.org/talk/index.php?topic=6898.msg43907700#msg43907700)
(Aurelius: "US Pat 2155194 Alpha-alkylaminoacylophenones", Chemistry Discourse)Patent US2155194 (http://l2.espacenet.com/dips/viewer?PN=US2155194&CY=gb&LG=en&DB=EPD)
toPost 447186 (missing)
(Aurelius: "Ephedrine by reductive amination [GB302940]", Stimulants)Post 439077 (https://www.thevespiary.org/talk/index.php?topic=6898.msg43907700#msg43907700)
(Aurelius: "US Pat 2155194 Alpha-alkylaminoacylophenones", Chemistry Discourse)