Granted Patent
Utility
US 4,201,516 · App. 05/913,622
Impeller for a centrifugal machine
Inventors:
Michael Raymond Kolk, Ralph E. Beck, Roy E. Hoyle
Patented Case
View Patent ↗
Granted: May 6, 1980
Filed: Jun 8, 1978
Inventors
Michael Raymond Kolk
Ralph E. Beck
Roy E. Hoyle
Assignee (at issue)
CARRIER 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.