IP Library › Granted Patent US 3,931,855
Granted Patent Utility
US 3,931,855 · App. 05/517,390

Downhole packer actuated vent assembly

Inventors: Roy R. Vann, Flint R. George
Patented Case View Patent ↗
Granted: Jan 13, 1976 Filed: Oct 23, 1974
Inventors
Roy R. Vann
Flint R. George
Assignee (at issue)
Vann Tool Company, 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 3,931,855
App. No.
05/517,390
Filed
1974-10-23
Granted
1976-01-13
Kind
A