Granted Patent
Utility
US 4,267,056 · App. 06/027,332
Sample preparation apparatus and process for the use thereof
Inventor:
Thomas D. McClure
Patented Case
View Patent ↗
Granted: May 12, 1981
Filed: Apr 5, 1979
Inventor
Thomas D. McClure
Assignee (at issue)
Johns Manville
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.