Granted Patent
Utility
US 5,128,441 · App. 07/519,080
Block polyamido condensation products
Inventors:
George P. Speranza, Jiang-Jen Lin
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: May 4, 1990
Inventors
George P. Speranza
Jiang-Jen Lin
Assignee (at issue)
Texaco Chemical 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.