Granted Patent
Utility
US 4,929,749 · App. 07/323,977
Production of terephthalate esters by degradative transesterification of scrap or virgin terephthalate polyesters
Inventors:
Ved P. Gupta, Louis Dupont
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Mar 15, 1989
Inventors
Ved P. Gupta
Louis Dupont
Assignee (at issue)
Synergistics Industries, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.