Granted Patent
Utility
US 4,235,580 · App. 05/911,527
Noise suppression structure for block making machinery
Inventors:
Thomas W. Springs, William F. Wallis
Patented Case
View Patent ↗
Granted: Nov 25, 1980
Filed: Jun 1, 1978
Inventors
Thomas W. Springs
William F. Wallis
Assignee (at issue)
BESSER COMPANY
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.