Granted Patent
Utility
US 4,231,192 · App. 06/002,887
Linear output force door operator
Inventors:
Kristupas Daugiras, Samir M. Elguindy
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Jan 12, 1979
Inventors
Kristupas Daugiras
Samir M. Elguindy
Assignee (at issue)
VAPOR CORP.
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.