Granted Patent
Utility
US 4,378,408 · App. 06/233,342
Silicate coated roofing granules
Inventor:
Ingo B. Joedicke
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Feb 11, 1981
Inventor
Ingo B. Joedicke
Assignee (at issue)
GAF 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.