Granted Patent
Utility
US 4,351,537 · App. 06/112,686
Multipart skate
Inventor:
Sigurd Seidel
Patented Case
View Patent ↗
Granted: Sep 28, 1982
Filed: Jan 16, 1980
Inventor
Sigurd Seidel
Assignee (at issue)
The Washington Group, LLC
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.