IP Library › Granted Patent US 4,645,538
Granted Patent Utility
US 4,645,538 · App. 06/739,978

Asphaltic compositions

Inventors: William E. Wright, Edward F. Zaweski
Patented Case View Patent ↗
Granted: Feb 24, 1987 Filed: May 31, 1985
Inventors
William E. Wright
Edward F. Zaweski
Assignee (at issue)
Ethyl Corporation

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 4,645,538
App. No.
06/739,978
Filed
1985-05-31
Granted
1987-02-24
Kind
A