IP Library › Granted Patent US 5,290,073
Granted Patent Utility
US 5,290,073 · App. 07/862,133

Expansion seal for cable pipe

Inventor: Chung-Fang Chen
Patented Case View Patent ↗
Granted: Mar 1, 1994 Filed: Apr 2, 1992
Inventor
Chung-Fang Chen

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 5,290,073
App. No.
07/862,133
Filed
1992-04-02
Granted
1994-03-01
Kind
A