IP Library › Granted Patent US 4,714,459
Granted Patent Utility
US 4,714,459 · App. 06/812,779

Three stage intracranial pressure control valve

Inventor: Michael D. Hooven
Patented Case View Patent ↗
Granted: Dec 22, 1987 Filed: Dec 23, 1985
Inventor
Michael D. Hooven
Assignee (at issue)
CORDIS CORPORATION

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 4,714,459
App. No.
06/812,779
Filed
1985-12-23
Granted
1987-12-22
Kind
A