IP Library › Granted Patent US 4,934,908
Granted Patent Utility
US 4,934,908 · App. 07/336,163

Vacuum pump systems

Inventors: David Alan Turrell, Nigel T. M. Dennis
Patented Case View Patent ↗
Granted: Jun 19, 1990 Filed: Apr 11, 1989
Inventors
David Alan Turrell
Nigel T. M. Dennis
Assignee (at issue)
The BOC Group plc

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 4,934,908
App. No.
07/336,163
Filed
1989-04-11
Granted
1990-06-19
Kind
A