Granted Patent
Utility
US 3,972,948 · App. 05/528,425
Anhydrous catalyst for manufacture of glycol ethers
Inventors:
George Joseph Laemmle, Kenneth Carol Rightmer
Patented Case
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Granted: Aug 3, 1976
Filed: Nov 29, 1974
Inventors
George Joseph Laemmle
Kenneth Carol Rightmer
Assignee (at issue)
Jefferson Chemical Company, Inc.
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.