IP Library › Granted Patent US 5,879,231
Granted Patent Utility
US 5,879,231 · App. 08/976,025

Mine ventilation structure

Inventor: Frank A. Sisk
Patented Case View Patent ↗
Granted: Mar 9, 1999 Filed: Nov 21, 1997
Inventor
Frank A. Sisk

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Quick Facts
Patent No.
US 5,879,231
App. No.
08/976,025
Filed
1997-11-21
Granted
1999-03-09
Kind
A