Granted Patent
Utility
US 4,194,652 · App. 05/955,529
Collapsible receptacle for flowable materials
Inventors:
Robert R. Williamson, Norwin C. Derby
Patented Case
View Patent ↗
Granted: Mar 25, 1980
Filed: Oct 30, 1978
Inventors
Robert R. Williamson
Norwin C. Derby
Assignee (at issue)
Super Sack Mfg. Corp.
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.