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Last Updated: December 31, 2025

Claims for Patent: 6,037,508

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Summary for Patent: 6,037,508

Title:	Process for preparing 1,1,1,2-tetrafluoroethane
Abstract:	1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr2 O3 carried on AlF3.The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.
Inventor(s):	Paolo Cuzzato, Antonio Masiero
Assignee:	Solvay Specialty Polymers Italy SpA
Application Number:	US09/209,942

Details for Patent 6,037,508

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Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Takeda Pharmaceuticals U.s.a., Inc.	ADVATE	antihemophilic factor (recombinant), plasma/albumin free method	For Injection	125063	July 25, 2003	6,037,508	2018-12-11
Takeda Pharmaceuticals U.s.a., Inc.	ADVATE	antihemophilic factor (recombinant), plasma/albumin free method	For Injection	125063	April 12, 2006	6,037,508	2018-12-11
Takeda Pharmaceuticals U.s.a., Inc.	ADVATE	antihemophilic factor (recombinant), plasma/albumin free method	For Injection	125063	July 03, 2007	6,037,508	2018-12-11
Takeda Pharmaceuticals U.s.a., Inc.	ADVATE	antihemophilic factor (recombinant), plasma/albumin free method	For Injection	125063	July 12, 2012	6,037,508	2018-12-11
>Applicant	>Tradename	>Biologic Ingredient	>Dosage Form	>BLA	>Approval Date	>Patent No.	>Expiredate

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