IP Library › Granted Patent US 5,150,721
Granted Patent Utility
US 5,150,721 · App. 07/596,654

Tobacco smoke filter material and process for production thereof

Inventors: Benedict M. Lee, James E. Harris
Patented Case View Patent ↗
Granted: Sep 29, 1992 Filed: Oct 10, 1990
Inventors
Benedict M. Lee
James E. Harris

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 5,150,721
App. No.
07/596,654
Filed
1990-10-10
Granted
1992-09-29
Kind
A