IP Library › Granted Patent US 4,631,992
Granted Patent Utility
US 4,631,992 · App. 06/838,204

Screwdriver

Inventor: Richard E. Eckman
Patented Case View Patent ↗
Granted: Dec 30, 1986 Filed: Mar 10, 1986
Inventor
Richard E. Eckman
Assignee (at issue)
Dresser Industries, Inc.

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 4,631,992
App. No.
06/838,204
Filed
1986-03-10
Granted
1986-12-30
Kind
A