Granted Patent
Utility
US 4,804,553 · App. 06/909,156
Alkali metal acid pyrophosphate leavening acid compositions and methods for producing the same
Inventor:
Robert H. Tieckelmann
Patented Case
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Granted: Feb 14, 1989
Filed: Sep 19, 1986
Inventor
Robert H. Tieckelmann
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.