Granted Patent
Utility
US 4,242,725 · App. 05/856,279
Light reflector structure
Inventors:
William L. Douma, Ward E. Brigham
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Dec 1, 1977
Inventors
William L. Douma
Ward E. Brigham
Assignee (at issue)
Sun Chemical 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.