Granted Patent
Utility
US 4,731,905 · App. 06/858,583
Overhead door torsion spring assembly and method
Inventors:
Richard J. Milano, Coy H. Burgess, William F. Wadsworth
Patented Case
View Patent ↗
Granted: Mar 22, 1988
Filed: May 1, 1986
Inventors
Richard J. Milano
Coy H. Burgess
William F. Wadsworth
Assignee (at issue)
Raynor Mfg. Co.
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.