Granted Patent
Utility
US 4,994,281 · App. 07/119,361
Polylactic acid microspheres and process for producing the same
Inventors:
Shozo Muranishi, Yoshito Ikada, Hiroshi Yoshikawa, Shokyu Gen
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Nov 10, 1987
Inventors
Shozo Muranishi
Yoshito Ikada
Hiroshi Yoshikawa
Shokyu Gen
Assignees (at issue)
Sanraku Incorporated
Biomaterials Universe Inc.
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.