Granted Patent
Utility
US 4,574,642 · App. 06/674,437
Apparatus for automated crack growth rate measurement
Inventor:
Thomas Sherwood Fleischman
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Nov 23, 1984
Inventor
Thomas Sherwood Fleischman
Assignee (at issue)
The Firestone Tire & Rubber Company
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.