Granted Patent
Utility
US 5,458,828 · App. 08/179,702
Method for constructing one-step grout fixed window frames in a concrete-structured building
Inventor:
Yung-Chuan Chuang
Patented Case
View Patent ↗
Granted: Oct 17, 1995
Filed: Jan 11, 1994
Inventor
Yung-Chuan Chuang
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.