IP Library › Granted Patent US 4,909,706
Granted Patent Utility
US 4,909,706 · App. 07/007,479

Controlled clearance labyrinth seal

Inventors: Victor Emmanuel Bergsten, Edward P. Eardley
Patented Case View Patent ↗
Granted: Mar 20, 1990 Filed: Jan 28, 1987
Inventors
Victor Emmanuel Bergsten
Edward P. Eardley
Assignee (at issue)
Union Carbide 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 4,909,706
App. No.
07/007,479
Filed
1987-01-28
Granted
1990-03-20
Kind
A