Granted Patent
Utility
US 4,034,544 · App. 05/478,542
Method and apparatus for producing plied yarn and product thereof
Inventor:
Robert Clarkson
Patented Case
View Patent ↗
Granted: Jul 12, 1977
Filed: Jun 11, 1974
Inventor
Robert Clarkson
Assignee (at issue)
Uniroyal Ltd.
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.