IP Library › Granted Patent US 4,328,096
Granted Patent Utility
US 4,328,096 · App. 06/261,357

Dual flow screening apparatus

Inventors: David E. Chupka, Peter Seifert
Patented Case View Patent ↗
Granted: May 4, 1982 Filed: May 7, 1981
Inventors
David E. Chupka
Peter Seifert
Assignee (at issue)
Black Clawson Company, Inc.

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,328,096
App. No.
06/261,357
Filed
1981-05-07
Granted
1982-05-04
Kind
A