IP Library › Granted Patent US 5,284,978
Granted Patent Utility
US 5,284,978 · App. 08/035,486

Method for producing diphenyl sulfone compounds

Inventors: Ryoichi Kinishi, Yoshihiro Ozaki
Patented Case View Patent ↗
Granted: Feb 8, 1994 Filed: Mar 22, 1993
Inventors
Ryoichi Kinishi
Yoshihiro Ozaki
Assignee (at issue)
Yoshitomi Pharmaceutical Industries, 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 5,284,978
App. No.
08/035,486
Filed
1993-03-22
Granted
1994-02-08
Kind
A