Granted Patent
Utility
US 6,544,451 · App. 09/602,710
Direct sheet extrusion of solid surface sheet and profiled materials
Inventors:
Barry J. Heitner, Clyde Spencer Hutchins
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Jun 26, 2000
Inventors
Barry J. Heitner
Clyde Spencer Hutchins
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.