Granted Patent
Utility
US 4,176,115 · App. 05/794,368
Fire-resistant construction material
Inventors:
Seymour Hartman, Catherine M. Sheridan
Patented Case
View Patent ↗
Granted: Nov 27, 1979
Filed: May 6, 1977
Inventors
Seymour Hartman
Catherine M. Sheridan
Assignee (at issue)
Champion International Corporation Limited
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.