IP Library Granted Patent US 4,630,591
Granted Patent Utility
US 4,630,591 · App. 06/831,069

Stratified charge internal combustion engines

Inventor: Bernard Hooper
Patented Case View Patent ↗
Granted: Dec 23, 1986 Filed: Feb 20, 1986
Inventor
Bernard Hooper
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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 4,630,591
App. No.
06/831,069
Filed
1986-02-20
Granted
1986-12-23
Kind
A