Granted Patent
Utility
US 4,311,481 · App. 06/227,630
Method for improved dyeing
Inventor:
Eric L. Nelson
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Jan 23, 1981
Inventor
Eric L. Nelson
Assignee (at issue)
Nelson Research & Development 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.