IP Library › Granted Patent US 5,046,492
Granted Patent Utility
US 5,046,492 · App. 07/219,220

Clean room helmet system

Inventors: Wyman H. Stackhouse, Ian M. Williamson
Patented Case View Patent ↗
Granted: Sep 10, 1991 Filed: Jul 15, 1988
Inventors
Wyman H. Stackhouse
Ian M. Williamson

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 5,046,492
App. No.
07/219,220
Filed
1988-07-15
Granted
1991-09-10
Kind
A