Granted Patent
Utility
US 4,915,855 · App. 07/337,746
Viscosity regulators for water-based spin finishes
Inventors:
Gunilla E. Gillberg-LaForce, Helen A. Kravas
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Apr 13, 1989
Inventors
Gunilla E. Gillberg-LaForce
Helen A. Kravas
Assignee (at issue)
Hoechst Celanese Corporation
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.