Granted Patent
Utility
US 5,577,740 · App. 08/325,676
Thermal activated self-releasing seal for boiler
Inventor:
Gregory W. Purdom
Patented Case
View Patent ↗
Granted: Nov 26, 1996
Filed: Oct 19, 1994
Inventor
Gregory W. Purdom
Assignee (at issue)
Loral Fairchild 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.