Granted Patent
Utility
US 4,258,457 · App. 05/800,389
Method for coating and crimping synthetic thermoplastic
Inventors:
James K. Hughes, Wayne K. Erickson
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: May 25, 1977
Inventors
James K. Hughes
Wayne K. Erickson
Assignee (at issue)
Phillips Petroleum 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.