Granted Patent
Utility
US 5,925,699 · App. 08/847,789
Concrete curing admixtures
Inventors:
Peter Ellenberger, Bernhard Leikauf, Qiwei Yang
Patented Case
View Patent ↗
Granted: Jul 20, 1999
Filed: Apr 28, 1997
Inventors
Peter Ellenberger
Bernhard Leikauf
Qiwei Yang
Assignee (at issue)
MBT Holding AG
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.