Granted Patent
Utility
US 5,887,400 · App. 08/848,860
Expansion control system
Inventors:
David J. Bratek, John Sobol
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: May 1, 1997
Inventors
David J. Bratek
John Sobol
Assignee (at issue)
Watson Bowman Acme 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.