Granted Patent
Utility
US 4,861,438 · App. 07/297,372
Method of making patterns
Inventors:
Christopher P. Banks, Edward Irving
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Jan 17, 1989
Inventors
Christopher P. Banks
Edward Irving
Assignee (at issue)
Ciba-Geigy
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.