IP Library › Granted Patent US 5,637,540
Granted Patent Utility
US 5,637,540 · App. 08/096,203

Sintered silicon nitride of high toughness, strength and reliability

Inventors: Chien-Wei Li, Jeffrey A. Goldacker
Patented Case View Patent ↗
Granted: Jun 10, 1997 Filed: Jul 23, 1993
Inventors
Chien-Wei Li
Jeffrey A. Goldacker
Assignee (at issue)
AlliedSignal, Inc.

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 5,637,540
App. No.
08/096,203
Filed
1993-07-23
Granted
1997-06-10
Kind
A