Granted Patent
Utility
US 4,237,771 · App. 06/053,023
Pneumatically operated actuator and method of making the same
Inventor:
Alfred A. Frankenberg
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jun 28, 1979
Inventor
Alfred A. Frankenberg
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.