Granted Patent
Utility
US 4,706,900 · App. 06/765,976
Retrofitable coiled spring system
Inventors:
Robert S. Prairie, Frank Paskowski
Patented Case
View Patent ↗
Granted: Nov 17, 1987
Filed: Aug 15, 1985
Inventors
Robert S. Prairie
Frank Paskowski
Assignee (at issue)
Combustion Engineering, 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.