IP Library › Granted Patent US 5,622,657
Granted Patent Utility
US 5,622,657 · App. 08/455,546

Prolonged release microparticle preparation and production of the same

Inventors: Shigeyuki Takada, Yoshiaki Uda, Yasuaki Ogawa
Patented Case View Patent ↗
Granted: Apr 22, 1997 Filed: May 31, 1995
Inventors
Shigeyuki Takada
Yoshiaki Uda
Yasuaki Ogawa
Assignee (at issue)
Takeda Chemical Industries 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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 5,622,657
App. No.
08/455,546
Filed
1995-05-31
Granted
1997-04-22
Kind
A