Granted Patent
Utility
US 5,349,149 · App. 07/844,648
Dual-purpose fluid for cutting and electrical discharge machining
Inventors:
Harumitsu Shiraki, Hiroyasu Sohtome, Kiyoshi Suzuki, Tetsutaro Uematsu, Lao-Sou Su
Patented Case
View Patent ↗
Granted: Sep 20, 1994
Filed: Apr 1, 1992
Inventors
Harumitsu Shiraki
Hiroyasu Sohtome
Kiyoshi Suzuki
Tetsutaro Uematsu
Lao-Sou Su
Assignee (at issue)
Castrol Limited Burmah Castrol House
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.