IP Library › Granted Patent US 4,977,217
Granted Patent Utility
US 4,977,217 · App. 07/214,861

Polyesters having improved impact strength

Inventors: Ronald H. Sunseri, Michael William O'Rourke
Patented Case View Patent ↗
Granted: Dec 11, 1990 Filed: Jul 1, 1988
Inventors
Ronald H. Sunseri
Michael William O'Rourke
Assignee (at issue)
Copolymer Rubber & Chemical 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.

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 4,977,217
App. No.
07/214,861
Filed
1988-07-01
Granted
1990-12-11
Kind
A