IP Library Granted Patent US 4,902,413
Granted Patent Utility
US 4,902,413 · App. 07/315,297

Organic-based porous microspheres for HPLC

Inventors: Richard W. Stout, Henry J. Leibu
Patented Case View Patent ↗
Granted: Feb 20, 1990 Filed: Feb 24, 1989
Inventors
Richard W. Stout
Henry J. Leibu
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY

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 4,902,413
App. No.
07/315,297
Filed
1989-02-24
Granted
1990-02-20
Kind
A