IP Library › Granted Patent US 4,246,137
Granted Patent Utility
US 4,246,137 · App. 06/044,004

Method of preparing zirconia-silica xerogels, the xerogels, and xerogel catalysts

Inventors: Robert A. Dombro, William Kirch
Patented Case View Patent ↗
Granted: Jan 20, 1981 Filed: May 31, 1979
Inventors
Robert A. Dombro
William Kirch
Assignee (at issue)
Chemplex, 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 4,246,137
App. No.
06/044,004
Filed
1979-05-31
Granted
1981-01-20
Kind
A