Granted Patent
Utility
US 4,547,266 · App. 06/518,465
Apparatus for providing selectively differentiated vacuum across a papermaking machine width
Inventors:
Martin Keller, Roger A. Ahrens
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Jul 29, 1983
Inventors
Martin Keller
Roger A. Ahrens
Assignee (at issue)
Sandy Hill Corporation
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.