Granted Patent
Utility
US 5,019,307 · App. 07/319,652
Method and apparatus for the manufacture of hollow ceramic beams using multiple molding mandrels
Inventors:
John R. Brewer, Joseph M. Swenson, Reginald Maas
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Mar 3, 1989
Inventors
John R. Brewer
Joseph M. Swenson
Reginald Maas
Assignee (at issue)
Coors Ceramics 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.