IP Library › Granted Patent US 4,825,906
Granted Patent Utility
US 4,825,906 · App. 07/203,253

Angle pattern control valve

Inventor: Thomas A. Hartman
Patented Case View Patent ↗
Granted: May 2, 1989 Filed: Jun 6, 1988
Inventor
Thomas A. Hartman

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 4,825,906
App. No.
07/203,253
Filed
1988-06-06
Granted
1989-05-02
Kind
A