IP Library › Granted Patent US 4,258,903
Granted Patent Utility
US 4,258,903 · App. 06/130,726

Spring-loaded valve actuator

Inventor: Irving C. Stevenson
Patented Case View Patent ↗
Granted: Mar 31, 1981 Filed: Mar 17, 1980
Inventor
Irving C. Stevenson
Assignee (at issue)
Thomas A. Short Co.

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 4,258,903
App. No.
06/130,726
Filed
1980-03-17
Granted
1981-03-31
Kind
A