Granted Patent
Utility
US 4,957,843 · App. 07/420,632
Prevention of short time scale reciprocity failure by viscosity control
Inventors:
Jesse Hipps, Sr., Amy L. Burkholder
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Oct 5, 1989
Inventors
Jesse Hipps, Sr.
Amy L. Burkholder
Assignee (at issue)
The Mead 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.