Granted Patent
Utility
US 4,522,776 · App. 06/508,668
Process for substantially eliminating surface melt fracture when extruding ethylene polymers
Inventor:
Arakalgud V. Ramamurthy
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Jun 28, 1983
Inventor
Arakalgud V. Ramamurthy
Assignee (at issue)
Union Carbide 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.