IP Library Granted Patent US 3,945,215
Granted Patent Utility
US 3,945,215 · App. 05/443,140

Low-loss, fluid helium transfer line suitable for extended lengths

Inventors: Robert W. Johnson, Paul R. Doherty
Patented Case View Patent ↗
Granted: Mar 23, 1976 Filed: Feb 14, 1974
Inventors
Robert W. Johnson
Paul R. Doherty
Assignee (at issue)
Cryogenic Technology, 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 3,945,215
App. No.
05/443,140
Filed
1974-02-14
Granted
1976-03-23
Kind
A