Granted Patent
Utility
US 5,725,657 · App. 08/823,781
Cement admixture product
Inventors:
David C. Darwin, Ellis Gartner
Patented Case
View Patent ↗
Granted: Mar 10, 1998
Filed: Mar 24, 1996
Inventors
David C. Darwin
Ellis Gartner
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.