Granted Patent
Utility
US 4,912,948 · App. 06/715,170
Vacuum guide used in flexible sheet material treatment
Inventors:
Russell L. Brown, Charles Joseph Cunningham, IV
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Mar 22, 1985
Inventors
Russell L. Brown
Charles Joseph Cunningham, IV
Assignee (at issue)
Union Carbide Chemicals & Plastics
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.