Granted Patent
Utility
US 4,527,374 · App. 06/109,378
Three-tab shingle with staggered butt edge feature
Inventor:
Raymond L. R. Corbin
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Jan 3, 1980
Inventor
Raymond L. R. Corbin
Assignee (at issue)
Manville Service 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.