Granted Patent
Utility
US 4,580,582 · App. 06/635,113
Smokeless ashtray
Inventors:
Clifford E. Grube, William Kalnins
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Jul 27, 1984
Inventors
Clifford E. Grube
William Kalnins
Assignee (at issue)
The Mills 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.