Granted Patent
Utility
US 5,215,857 · App. 07/726,140
1,2-quinonediazide containing radiation-sensitive resin composition utilizing methyl 2-hydroxypropionate, ethyl 2-hydroxypropionate or methyl 3-methoxypropionate as the solvent
Inventors:
Yoshihiro Hosaka, Ikuo Nozue, Masashige Takatori, Yoshiyuki Harita
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jul 3, 1991
Inventors
Yoshihiro Hosaka
Ikuo Nozue
Masashige Takatori
Yoshiyuki Harita
Assignee (at issue)
Japan Synthetic Rubber Corporation
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.