Granted Patent
Utility
US 4,504,401 · App. 06/521,407
Stainproofing agent and process for its preparation
Inventors:
Masashi Matsuo, Katsuji Itoh, Takao Hayashi, Yoshio Oda
Patented Case
View Patent ↗
Granted: Mar 12, 1985
Filed: Aug 8, 1983
Inventors
Masashi Matsuo
Katsuji Itoh
Takao Hayashi
Yoshio Oda
Assignee (at issue)
ASAHI GLASS CO., LTD.
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.