IP Library › Granted Patent US 6,820,355
Granted Patent Utility
US 6,820,355 · App. 10/276,795

Hydraulic control circuit of boom cylinder in work machine

Inventors: Tetsuya Yoshino, Yoshiyuki Shimada
Patented Case View Patent ↗
Granted: Nov 23, 2004 Filed: Nov 19, 2002
Inventors
Tetsuya Yoshino
Yoshiyuki Shimada
Assignee (at issue)
Shin Caterpillar Mitsubishi 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 6,820,355
App. No.
10/276,795
Filed
2002-11-19
Granted
2004-11-23
Kind
B2