Granted Patent
Utility
US 4,242,012 · App. 06/020,614
Method for constructing a multiseason ice platform
Inventor:
Michael E. Utt
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Mar 14, 1979
Inventor
Michael E. Utt
Assignee (at issue)
Union Oil Company of California
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.