Granted Patent
Utility
US 4,159,948 · App. 05/882,320
Beltless vacuum filter
Inventor:
William D. Crowe
Patented Case
View Patent ↗
Granted: Jul 3, 1979
Filed: Mar 1, 1978
Inventor
William D. Crowe
Assignee (at issue)
J.R. Schneider Co., Inc.
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.