Granted Patent
Utility
US 4,870,306 · App. 06/309,464
Method and apparatus for precisely moving a motor armature
Inventor:
Christian C. Petersen
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Oct 8, 1981
Inventor
Christian C. Petersen
Assignee (at issue)
Polaroid 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.