IP Library › Granted Patent US 5,426,109
Granted Patent Utility
US 5,426,109 · App. 07/936,811

Phenylnaphthalene hydroxy acids

Inventors: Yves Girard, Pierre Hamel
Patented Case View Patent ↗
Granted: Jun 20, 1995 Filed: Aug 27, 1992
Inventors
Yves Girard
Pierre Hamel
Assignee (at issue)
Merck Frosst Canada Ltd.

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 5,426,109
App. No.
07/936,811
Filed
1992-08-27
Granted
1995-06-20
Kind
A