IP Library › Granted Patent US 4,868,035
Granted Patent Utility
US 4,868,035 · App. 07/194,100

Electrical insulating materials made partly or wholly of polyester film

Inventors: Martin Weinberg, Leon Helfand
Patented Case View Patent ↗
Granted: Sep 19, 1989 Filed: May 16, 1988
Inventors
Martin Weinberg
Leon Helfand

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,868,035
App. No.
07/194,100
Filed
1988-05-16
Granted
1989-09-19
Kind
A