Granted Patent
Utility
US 4,346,229 · App. 06/145,515
Reaction products of DMT process residue and dipropylene glycol
Inventors:
Leighton K. Derr, Lyle B. Hawkins, Marlene J. Jones
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: May 1, 1980
Inventors
Leighton K. Derr
Lyle B. Hawkins
Marlene J. Jones
Assignee (at issue)
HERCULES LLC
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.