IP Library › Granted Patent US 4,275,570
Granted Patent Utility
US 4,275,570 · App. 06/159,502

Oil cooling means for refrigeration screw compressor

Inventors: Paul G. Szymaszek, Robert A. Hall
Patented Case View Patent ↗
Granted: Jun 30, 1981 Filed: Jun 16, 1980
Inventors
Paul G. Szymaszek
Robert A. Hall
Assignee (at issue)
Vilter Manufacturing LLC

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 4,275,570
App. No.
06/159,502
Filed
1980-06-16
Granted
1981-06-30
Kind
A