IP Library › Granted Patent US 4,807,700
Granted Patent Utility
US 4,807,700 · App. 07/098,377

Wireline downhole annulus valve

Inventor: Robert Lee Wilkins
Patented Case View Patent ↗
Granted: Feb 28, 1989 Filed: Sep 18, 1987
Inventor
Robert Lee Wilkins
Assignee (at issue)
Cameron Iron Works USA, 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 4,807,700
App. No.
07/098,377
Filed
1987-09-18
Granted
1989-02-28
Kind
A