Granted Patent
Utility
US 4,859,763 · App. 07/216,371
Preparation process of dl-lactic acid-glycolic acid-copolymer
Inventors:
Hiroshi Takayanagi, Tadashi Kobayashi, Takayoshi Masuda, Hosei Shinoda
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Jul 8, 1988
Inventors
Hiroshi Takayanagi
Tadashi Kobayashi
Takayoshi Masuda
Hosei Shinoda
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.