Granted Patent
Utility
US 4,926,650 · App. 07/195,704
Refrigerant fluid and method of use
Inventors:
Douglas D. Dawn, Reinhard Radermacher
Patented Case
View Patent ↗
Granted: May 22, 1990
Filed: May 18, 1988
Inventors
Douglas D. Dawn
Reinhard Radermacher
Assignee (at issue)
Pennwalt 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.