IP Library › Granted Patent US 4,772,748
Granted Patent Utility
US 4,772,748 · App. 06/845,497

Process for producing highly pure terephthalic acid

Inventors: Hiroshi Hashizume, Yoshiaki Izumisawa
Patented Case View Patent ↗
Granted: Sep 20, 1988 Filed: Mar 31, 1986
Inventors
Hiroshi Hashizume
Yoshiaki Izumisawa
Assignee (at issue)
Mitsubishi Chemical 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 4,772,748
App. No.
06/845,497
Filed
1986-03-31
Granted
1988-09-20
Kind
A