Granted Patent
Utility
US 4,846,641 · App. 06/756,665
Readily-removable floating bushing pump construction
Inventors:
Ferdinandus A. Pieters, Thomas B. Martin
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Jul 19, 1985
Inventors
Ferdinandus A. Pieters
Thomas B. Martin
Assignee (at issue)
Micropump, 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.