Granted Patent
Utility
US 4,747,240 · App. 06/290,617
Encapsulated PCM aggregate
Inventors:
Walter E. Voisinet, Deall Daymon, John A. Slyh
Patented Case
View Patent ↗
Granted: May 31, 1988
Filed: Aug 6, 1981
Inventors
Walter E. Voisinet
Deall Daymon
John A. Slyh
Assignee (at issue)
National Gypsum Company
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.